To some extent sure, but not nearly to the same extent as RPGs. Like, 2D and 3D platfomrers are pretty different due to the nature of the Z-axis, but at their core they're still about running and jumping around.
RPG's on the on the other hand can be turn based, tactical, real time, basically a hack n' slash, or Dark Souls. Since the bar for what constitutes an RPG is that the game's mechanics are stat driven, it's really become so diverse that I question why it's so broad in the first place. You may not like a handful of the major RPG categories, but I still don't think they should be grouped together in terms of appeal.