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I have to concur with some of these (Shrek 2, Evil Dead 2, etc) which I enjoyed more than the original themselves. I love Toy Story 2 as well (3 is my favorite, but I honestly can't give a straight forward answer in terms of which one I enjoy out of the first two, it's a toughie!) There's also a few I also enjoy, including The Hangover 2, and Ghostbusters 2, and Harold and Kumar Escape From Guantanamo Bay, but definitely not as much as the originals.
A few I'll add are Ge Him To The Greek, Madagascar Escape 2 Africa, and Rugrats In Paris, (random, I know, but hey, it came to mind, I love the Rugrats!) This Is 40, and Iron Man 2 (I know, kind of stretching it, but these films get a lot of laughs in.)