Your typical X experience. When you’re not going around killing soulless scrap metal, you’re trying to get your HP back that you should have had from the get-go. Most heart containers are hidden so well, you’ll probably need a guide. This is just to get your HP bar to any competent level, otherwise you’ll have problems beating the game. Secrets like these are poor design elements. Secrets are meant to be secrets, not something you absolutely need.
Other than that, the game is not horrible. The Mavericks are mostly fun to fight, the weapons and weaknesses make sense, and the overall quality of the game is pretty oustanding. Some control issues here and there, like accidental d-pad dashing.