Reading IGN's review confused me. It sounded like they loved the Mega Man Anniversary Collection more, despite reversed controls and lame extras. (I liked the video about his origins and stuff, but I thought the unlockable music weren't that great of extras.) They even liked the "platforming-like" game-select screen, when IMO it looked sloppy...
I haven't played X6...I thought X4 and X5 in particular were, like, yawn, mostly...I'm most interested in Battle & Chase, which REALLY should've been in the Anniversary Collection, but eh, I complain too much.