IMHO first movie was everything: Interesting, clever, intriguing, intelligent, captivating, just continue with superlatives...
Heck, I registered here just to be able to rate it, and I've praised it to my friends. Most of them liked it as well.
I was thrilled when I've heard about this sequel and I was eager to watch it.
Now I would like to un-watch it, because it was completely unnecessary, it actually destroyed mystique of first movie.