Really damn good. Gen 4 was one of the strongest eras of the franchise and games like Platinum are why. It improved upon basically everything that Diamond and Pearl struggled to achieve. I like the team of villains and how absurd their goal is. It's certainty memorable. All the gym leaders are cool.

I love the gen 4 roster of Mons in general. And there's good variety in typing and design. Gameplay wise it's a really solid entry. It has battle frontier. It has an awesome post game.

There are minor gripes. There's padding in many areas. Walking through the snow will never be fun. A big problem that is a product of its time is a lot of the cool content being locked to timed events. You can't access a ton of awesome stuff here anymore.

I am biased towards Heartgold but this is on par in terms of quality.