Watch the Function Junction Rhythm online guitar lesson by Jeff Scheetz from Blues-Rock: Secret Sauce
Our rhythm section is based around a funky groove. Of course I'm going to champion the merits of keeping your right hand going - down,up,down,up,down,up,down,up etc etc etc - you get the point right? This is the most critical technique when trying to master rhythm chops!
So work on it no matter how rhythmically challenged you think you are - it will get better, and when it does it will unlock tons of songs and grooves that you were only hacking at before - groove is everything!