He may be a shadow of his former self as of now, but no one, and I mean NO one, can fuck with the glory days of his career. Not just his days with Eazy, Ren, and Dre, either; no, his first few albums were just as legendary. AmeriKKKa's Most Wanted, Death Certificate, and The Predator... few artists have anything on that trio of albums. Sure, he may have started to lose the fire after that, but damn if he didn't have a great run.
Say what you will about the Ice Cube of today, but the Ice Cube of yesterday was one of the best fucking MCs around. AmeriKKKa's Most Wanted is the kind of album you'd want for a desert island.