I used to have extreme difficulty with the moving platforms in Guts Man's stage, but now I don't really die at all. In fact, I'm surprised at how short that stage really is now that I've gotten better at it.

The disappearing platforms in Ice Man's stage are still annoying. There's not really anything fun about that stage, now that I think about it.

The ride chaser stages in X7-X8 are just badly implemented. The one in X8 makes me feel like I'm playing Microcosm, minus the silly dubbing. I liked how the ride chaser was done in X2, since it felt like an extension of the ride armor concept, if not done quite as well. Even the PSX games with their on-rails stages were passable, if frustrating. Making them 3D just exacerbated the design flaws.