Chances are you will not get a rave review. (Possibly Sin City being the exception).
On some of the Comic Based films out there.
Mystery Men: Fun film. Comic is so off kilter it does not matter.
Hulk (Ang Lee): Boring film with some cool action sequences. Far removed from the comic.
V for Vendetta: Good film, unless you read the book then it becomes a shadow of what could have been.
300: Great film for what it is. A decent parallel to the graphic novel.
Road to Perdition: It is a great film but nothing like the equally great comic.
Blade: Ugh, if it was not linked to blade a comic book person would figure it was loosely based on Blade. Its just an over the top action series.
Ghost World: Another good film. Good comic as well. A decent parallel
Hell Boy: Great escapist fun. Gets the character pretty well.
Batman: Depends on which one you mean, these are all over the map. None of the films are as good as the comic character.
Superman: The movies and TV shows all fall way short.
X-men: Movie II was good. You can pick this apart as a comic book fan pretty easy. At least they made the Toad better then the comic.
Spider man: Good first film, even if they did mess up quite a lot. The subsequent two films quickly went down hill.
A History of Violence: Okay film Starts out rock solid, then drifts away from the comic and frankly goes south.
Dare Devil: The movie was pretty bad, If you get the DVD (Directors cut) it is much better.
Ghost Rider: The movie was pretty good and faithful. Then again the comic book character was pretty thinly veiled Evel Knievel knock off.
The Crow: Complete divergence from the book, Sad because of Brandon Lee dying.