I don't find the controls floaty, but yeah the 3 plane thing was a bad idea. I think the game would've been better in everywhere if it was just a 2.5d platformer on a single plane. The 3 plane thing limits you at times when building a level because you don't want the player to jump back into a plane full of lava or something when making a front plane jump. I noticed this being a big issue when trying to ace the skulldozer level.
Otoh, some of you guys like DC need to chill about LBP suddenly collapsing and everything being a failure. Sure there are problems, but all in all they affect you maybe 10% of the time. The majority of the time LBP delivers on being an incredible user-content driven game. Go play the levels in the gaf user-level thread and come back and try to say you are disappointed in LBP. There are already more MM-calibur user-levels than there are MM levels in the game. Once image importation from the hard drive is implemented (and it is 100% coming going by the devs blog), levels are just going to get even better. Sure there will be hiccups with moderation and good levels will be taken down occasionally (though if the creators are not stubborn they will just re-up the level with visual changes; you can't copyright gameplay [well, maybe tetris]), but overall LBP has continued to produce incredible experiences one after another since launch and I only see the community getting better, not worse as months and years go by.
I agree that LBP is flawed. It's probably an 8.5-9.0 game to me from a critical perspective. Yet it's easily the best game I've played not only on the PS3, but this entire generation by giving form to the imagination of people around the world. There are hundreds of "worlds" people have created already from the depths of their minds and the joy of exploring them and obtaining their objects/textures for your own creations is pure fun. I was always a fan of rpg maker, fighter maker, N+, and any game that stresses the endless imagination of user minds. LBP is the best realization of this to date, and as a nice bonus it's a pretty darn good looking engine to make visual beauties out of.