As compared to the base game, this expansion just misses a step for me, but it is still really great and if you like the base game then it is worth giving this the time. It is a quick playthrough with some interesting aspects to it.

The combat itself is still very compelling, with the minor additions doing more to detract than bolster it.
The basics are a new enemy type that buffs all the enemies in an encounter. They are super weak, so it effectively just means you kill them first, which mixes things up only slightly and isn't that compelling. Another minor addition is that enemies now swap stances, forcing you to swap to effectively combat them. I found the stances to be the least interesting part of Ghost of Tsushima's combat and bringing more attention to them doesn't do the game any favors. It is even more apparent that the actual differences between the stances are pretty unnoticeable and entering the correct stance doesn't have enough obvious benefit to really work as a mechanic I care about.
An additional non-combat mechanic of a grappling hook doesn't add a ton of new gameplay -- just some new movement challenges/interactions that are just lock/key for the most part. I would have liked if there was more opportunity for the grappling hook to switch up how I approached areas or dealt with enemies during combat.

Environments are incredibly beautiful, just like in the base game, this is the most visually compelling open world game I have played.

The new archery challenges were satisfying and fun and I like that they gave me a reward that enabled me to complete them all, it was a quick, fun diversion.
The animal sanctuaries were less impressive. Though narratively interesting (they flesh out a bit about Jin's mother), the presentation and gameplay just feels fairly janky and unsatisfying.

The narrative here is a high point. Iki Island is a place harmed by the Samurai of Tsushima in much the same way the Mongols are invading in the base game. It is cool to see Jin dealing with his memories of this place and his father, how his father died here, and what he owes or doesn't owe to these people. I liked seeing Jin struggle with this, though the mind-altering poison conceit felt unnecessary and ineffective to me.
There are a couple of cool side quests that feed directly into this narrative as well. One that stood out for me has Jin recovering his father's horse armor as he does for legendary heroes/villains in the main game. It has taken on a mythical and demonic status with the people of the island, which is a great lens through which to see all of these quests you have already completed. You know both sides and it is clear that it isn't quite as simple as Sakai being either a hero or a villain.

This is a great expansion. Worth giving a try if you enjoyed the main game!

Far from the worst expansion I've ever played but definitely not the most inspired one either. Iki Island is the very archetype of a DLC. It's just more. On the one hand, that means more of Sucker Punch's gorgeous environments and slick, stylish combat, which is always a good thing. But it also means clearing out more enemy-infested strongholds and slicing through another set of bamboo stands, which if you fully completed the main game, you're almost certainly burnt out on (at least there are no fox dens this time, dear god).

The story set up is competent; as with the main game, Sucker Punch's weakness is finding compelling narrative beats to fill the second act with, but the first and third acts are an engaging mix of stunning set pieces and epic showdowns. The more we get of Jin, the more it seems like Sucker Punch is turning him into samurai Batman, which I won't lie, goes hard. I guess this is sort of like his Scarecrow chapter, with several trippy flashback scenes that give Jin some much-needed depth. It would've been nice to see these fleshed out into entire full-length sequences, but what we got is a worthwhile addition to the core storyline.

But yeah, all in all, it's fine. If you liked Ghost of Tsushima and you weren't finished with it after beating the main campaign, this is basically just a handful of new activities to whet your appetite. Is it an essential revisit? For the price, no. But if you're exploring PlayStation Extra and you're like, oh yeah, I liked slicing dudes up on a scenic island while the hottest tunes ever serenaded me, then jump back in and give it a go.

Even if you enjoyed the gameplay loop of the main game, I would advise you to wait for a few months before starting this DLC as it's basically more of the same. It adds a whole new island to explore, a couple of new abilities, and a few new interactive activities like archer challenges, wooden sword tournaments, and flute playing. Unfortunately, the plot doesn't add anything new despite its premise of looking back at Jin's past and the ambiguities of his father. It felt like they tried a little harder with cinematics, though.

Ghost of Tsushima: Iki Island é uma dlc do título com mesmo nome, porém que se passa na ilha Iki. O jogo se inicia quando guerreiros mongóis da tribo da Águia matam pessoas na ilha de Tsushima e Jin Sakai descobre que essa tribo invadiu a ilha Iki e está matando seus moradores, então ele decidiu intervir nesse “novo” ponto de conflito contra o Império Mongol. Na dlc nos aprofundamos no passado que Jin tem com a ilha, e ao mesmo tempo lutamos contra os mongóis e corsários seguidores da Águia, tendo uma narrativa passado presente. Nela não temos muitas mudanças em questão de gameplay, foi adicionado algumas mecânicas como dash com o cavalo, alguns coletáveis novos e etc. Falando sobre o combate, ele continua idêntico, a única adição que influencia nele é a criação de três tipos de inimigos novos. O duelo contra o final boss, na minha opinião é muito foda e é a melhor luta de todo o jogo. Em suma é uma dlc muito competente que tem o mesmo nível do jogo, se gostou do game principal vai gostar da dlc.

More Ghost of Tsushima! I really like what it adds to the game's story and how it generally wraps up a lot of the threads relating to Jin's past, and how it serves as a completion of his arc. The gameplay is more GoT, and that's a mix of good and bad, as my playthrough was about 86 hours total and I completed just about every tale and side tale, and every objective on the map, and the repetition does start to settle in a bit. This is only really something I think you'd experience going for near full completion like I was. Also I loved the island itself was really fun to explore, I liked it way more than the final portion of the island in the main game.