I don't think it's missing any features. Not that I know of offhand. If anything, there are more: You can choose updated or original graphics, offline and online coop, leaderboards, and downloadable replays. The port took them over two years to develop.
Oh they definitely added stuff. I could've sworn there was something that felt different, but really now you just make me want to hook my 360 back up...or get an X1X finally.