Being a Memphis native, there's a long long list of place to eat ribs in Memphis that rank way higher that Rendezvous. The only time I've gone is when folks from out of town that don't know any better insist on going. I don't know any locals who would voluntarily go there. They're OK and beat anything outside of Memphis (I'm looking at you Texas, BBQ involves only a dead hog, anything else is "grillin'" and WTF is brisket anyway?)
Gus' Fried Chicken cannot be beat (in Memphis or go to the original location in Mason), Gus' is the only thing I can think of that's worth risking your medical over, and the risk is real. One of their mottos is "If you've had better chicken, you must've been the rooster"