I agree, I don't know how anyone could hate It's a Small World. I could hear the song for hours and not get tired of it. It's fun, it's infectuous, and it's classic Disney.
As for Stitch, I still don't get all the hatred for it. I think it has the "Disney magic" in spades. After going on it the first time, I was impressed enough to turn right around and go on it again. I've been in it 6 times now and I enjoy it more each time. It's far better than its predecessor (though admittedly that's not saying much), and I've yet to hear the oft-cited crying child in it. In fact, I've only heard children laughing and afterward say how much they liked it. I even overheard one child at Animal Kingdom asking his parents if they could go back to the Magic Kingdom to ride Stitch again.
Nemo - I feel the attraction is very good, it's just in the wrong Park. Had it been in Fantasyland or somewhere in Animal Kingdom (ie. next to Nemo: The Musical, though that would have been overkill) it would have been perfect.
Thunder Mountain - Wow. Why do you hate this? Just curious.
And rdour@techminds, I'm with you 100%. Narnia was such a joke. And I waited 15 minutes for it! Oh, and the White Witch is real, not animatronic...though that might have been more interesting to me if it was.