out of the ones I have seen, Righteous Kill is definitely the best. It is a De Niro-Pacino film, and it is an NYPD cop flick. It is more than a little bit gritty, yet has an amazing plot, amazing characters, amazing acting, and is amazingly well done.
I gonna come up with an original idea here. Dark Knight was the best movie of 2008, great action and great performances. Otherwise it was a pretty mediocreyear not much that was particularly special.