The only sequel that I really like to revisit on occasion is The Lost World, mainly for Spielberg's casual genius direction. There are a couple of stand out set pieces (one involving glass, the other grass). I also love John Williams's ingenious score - almost entirely different from the first film, eschewing big hummable themes in favour of propulsive, Steiner-esque percussive thrills. Oh, and Jeff Goldblum is hilarious.