I miss many stages. I was dissapointed in Green Greens, as it's barely playable as is. It's true that there were two many Battlefield look alikes in Melee, but FoD was freakin' awesome. Sure, you can mostly recreate it, but c'mon.
Brinstar Depths was enjoyable, and while some courses might give you a similar feel(Frigate Orpheon), nothing beats the playability of the spin.
Hyrule Temple is fun but it's terrible for any tourney. New Pork City just plain sucks, anyway. The Yoshi stages are okay, and where's Peach's Castle(either version)? No Bowser stage either, which is very lame. Not to mention that Pirate Ship's actual ship design is just the Rainbow Ride's design.
Rainbow Ride SUCKED anyway, so having it back was a letdown. I understand that Mute City returning would be too cliché, but the music rocked. Big Blue wasn't very playable, anyway. We get Pokemon Stadium 1, but not Flat Zone 1? Where's the justice?! I was also dissapointed in the lack of Kirby stages compared to Melee which had 2 new ones. I'm sick of fighting Kirby, DDD, and Metaknight in the Halberd on All-Star, same with anyone else with one course(save Sonic, Snake, and Falcon).
Yeah, the stage selection is mostly terrible, with good ones here and there.