Nobody else will say it, so I'll pick The Dark Knight Rises. Other favorites of mine from trilogies that I love are Scream 3 and The Bourne Ultimatum. What can I say? I'm a sucker for the third films in trilogies.
For some other sequels nobody else will remember or bother to mention: Scary Movie 2 and Scary Movie 3, Next Friday, American Pie 2, Austin Powers: Goldmember, Rush Hour 2, Transporter 2, Mission: Impossible III and Mission: Impossible - Ghost Protocol. For newer horror movies, Insidious: Chapter 2 is great, Terrifier 3 was much better than Terrifier 2, and MaXXXine is the best film in the trilogy. Split was also great even though Glass wasn't, and Creed II is the best of the Michael B. Jordan series.