* I miss L-cancelling, dash-dancing, wavedashing, momentum based physics, and all of the crazy tech you had in Super Smash Bros. Melee. 4 is still a cool game, but it's just not the same.
* I miss games having cheat codes. I guess you can't really do that anymore because of the internet, everyone would find all the secrets in minutes...
* Chrono Trigger's multiple endings
* I feel like Mario's moves and athleticism get nerfed more and more in every game. In 64 he could punch, kick, long jump, do sliding kicks, breakdance flares, etc. Go watch some Mario 64 speedruns. He plays like a ninja in that game. In the games now he's not nearly as nimble or agile. I also miss the series' experimental nature. It feels like they're just rehashing the tired NSMB-styled art/music/physics/etc. ad nauseam.
* Parrying in 3rd Strike
(...Even though I'm not very good at it )
* If they get rid of all the X-men in this new Marvel vs. Capcom...