First, some people will just not like the cutesy adorable sackplanet art style, there's no going around that.
Second, controls really do fly all over the place until you get used to it and then it all sits in it's place and you can appreciate the detail and depth of jumping mechanic alone.
As for everything else, I don't know, I just never had so much fun in a game, playing with others. Maybe waaay back when on the SNES when everyone would come to my place and we would all play with that one controller...
I played it with friends of 20 years and my little cousin of 6, it was just fun, with emotes and the dancing and arms flailing and slapping everyone around and making a sad face and begging for forgiveness...
I can tell you one more thing, you don't ever have to make a level, EVER! There is just no chance you run out of content, brilliant content, retarded content, penis content, hard, easy, stupid...
But getting couple of friends next to you on the sofa, or even over the PSN and just messing around in the creator area and trying out crazy shit you got exploring other peoples levels, it's just priceless, if you have tequilla too, I can guarantee you will have to try really hard to remember the last time when you were laughing so hard.
OK, maybe I am LittleBigHigh on LittleBigPlanet right now, but I'm telling you, if all those gameplay videos on the Tube looked even remotely fun to you, this game will bring you hours and hours of fun, and then even more hours with someone beside you.