I've only played the demo and that was enough.
I don't get this argument that if you aren't supposed to take a game seriously, then that excuses it for being shit.
Which WET is. Yes I know it's just supposed to be stupid fun which I can appreciate, but when that's all your game is riding on why not try throwing something, I don't know, interesting/original/well polished/good looking/funny/actually exciting in there?
After all, if it was a "serious" shooter, and you ran through a load of crappy environments then it'd be fine. On WET though:
"Don't mind the shit environments or character models, it's only meant to be a bit of fun."
Like I said, I've only played the demo, but that coupled with the reviews I've read and I've got a pretty good idea of what the game is like.