Since it seems like no one else has pointed it out yet: please check the content warnings for this game if you're interested in playing it. Avoid this game at any cost if you get triggered by implications of rape, child abuse, sexual harassment, panic attacks, gore/body horror and pedophilia. The writing (and sometimes even gameplay) can be quite iffy to a harmful degree and downright disturbing, significantly more so than other DR games. Keep that in mind while playing. If you plan to get through the whole series I can't say that this game is unimportant enough to skip, as it does add a decent amount of lore. However, should the aforementioned content warnings apply to you, I recommend looking up a reliable summary to read instead, if you don't want to miss any noteworthy elements of the story.

optimal udg experience:
1. turn on the soundtrack
2. play literally any other third person shooter
3. watch cutscenes from udg every 20 minutes

this game sucks

This is easily the best Mega Man collection to come out of Capcom right now. The input lag is nonexistent compared to prior releases, and it does have some great extras like alternate music for some segments and the ability to unlock and use the Z3 ecards. ZX is set up in a way where you can for the most part comfortably use the touch screen even on a gamepad, and there's quite a few options for customizing the experience. The ports themselves run great and if you're on PC you have the added bonus of being able to mod the music out for their cleaner, crisper, higher-quality CD counterparts (look it up!).

The games have always been fantastic - Zero 1 and Zero 4 are considered the weaker titles, as well as the ZX series, but at their worst I'd say they're "fun", whereas Zero 2 and Zero 3 are highlights, well-known for being masterpieces amongst action platformers. Great visuals, strong music, tight gameplay and interesting narratives make up all the games in this collection, so if you want to get into the series this is far from a bad way to start.