First, if you are a fan of cameos, then this movie is for you. I don't think I've ever seen to many cameos in one movie before!
Second, this movie is "different". I'm not sure how it will play out in theaters. It'll either be a monster hit, or it will bomb big time. For that matter, I'm not sure at this point how I felt about it. Parts were funny, but some other parts were so incredibly stupid that I was groaning. Then again Scary Movie did fantastic business and I thought it was horribly stupid.
I just wish Adam Sandler would stop with the "dumb guy" roles. It seems in most of his movies he has some dumb speech impediment that just isn't funny.
(Can anyone spot Ron Howard's brother? Egad!)
"It's all in the hips" 
Brad, I thought you would like Clint Howards character?
jk.
------------------
--"That's my story and i'm sticking to it!"--
Adam really should stop co-writing his movies and just let Tim Herlihy have full control. Herlihy was the only writer for The Wedding Singer and that's Sandler's best film. So I can't help but thing that all the funny scenes were Herlihy's doing or that having other writers throws off his talent. Or maybe The Wedding Singer was just a fluke.
I did like the big horny bird trying to hump Jon Lovitz in hell. But I'm really surprised they didn't throw in a Mephistopheles gag in there somewhere.
------------------
The man with the magic hands.
I was a bit disappointed by the movie. The Adam Sandler movie I have enjoyed the most was "Waterboy". "Little Nicky" is a very bizarre movie. A talking dog that accompanies Nicky most of the time? Ugh. The talking dog in "Road Trip" was pretty funny because the gag only lasted a few seconds, but I admit that Nicky's speech impediment and warped face, along with the talking dog, got old. If I'd made the movie, I would have gotten Nicky's face and voice straightned out early in the movie so it would have been a gag that lasted a few minutes rather than for the entire show.
Of course, any religious person will not like the movie. 
Maybe the next Adam Sandler movie will be better.
Evans A Criswell
http://home.hiwaay.net/~criswell/theatre/
Frankly, it didn't develop much from that. But the question is, did it need to develop?
I'd have to fight Roger Ebert for calling this one Sandler's best. It's an entertaining movie, but it's not exactly of what sandler does best. No, acting like a STUPID idiot doesn't do it for him. He just had to be his in your face self to make Happy Gilmore a great flick (i'd call that one his best).
I did like Rodney Dangerfield as the father of the devil, and I had to like Jon Lovitz's intro, even though he did eventually get humped by a bird.
Did I see right when I spotted Nicky's girlfriend as his teacher from Billy Madison?
------------------
"Trying is the first step towards failure!"
-Homer Simpson
That's not the teacher from Billy Madison.
Sorry for the confusion, but she looks pretty familliar!