50 Cent is very underrated. He's a great lyricist and rapper, much better than that asshole Kanye.
Ja Rule I had heard was a JW as a child. He had some good hits, was in a few movies (original Fast & Furious), but he just kinda fizzled out.
Rap and Hip/Hop really aren't my thing much anymore. A lot of these "rap battles" are just choreographed between the two artists in order to drum up fake drama and interest in their records. East Coast VS West Coast is classic example. They all win. $$$$.