It is getting quite hard to find an honestly well-written movie anymore, to tell the truth.
The only movie I have seen over the past few months that truly gripped me and just didn't let go throughout the entire course of the film was Frank Darabont's adaptation of Stephen King's The Mist. The ending was changed dramatically from King's novella of the same name, and the impact that it had was actually quite powerful and it leaves an impression. I walked away from that film not regretting that I had seen it.
Disturbia was a great film as well when I had seen it debut in theaters, although it was basically a remake of Hitchcock's Rear Window, which is an even greater classic film.
I am also a fan of the Saw series, but I will admit that the films did not get off to a strong start (Leigh Wannel and Cary Elwes' performance lacked painfully in places) and now are beginning to run perhaps a little long-in-the-tooth. However, the films are very involving and I appreciate that in a film.
But what I would really like to see is a film that is totally original, not based on anything, and that is very well written from the start and totally involving. I haven't seen anything like that in mainstream cinema for quite some time now.
All three movies were quite funny, although Van Wilder tends to wear thin after seeing it multiple times.