The graphics, the quality of work. The first time I played Renegade I didn't like it, since I didn't understand the game. The lag, bad graphics and so on got on my nerves. Then I started to read what people think of the C&C mode. From what I read, I could see why Renegade multiplayer was good.
I have also heard you guys are going to put some new vehicles, weapons, and character so I am always excited about that.