If you will be bored in a covers band then don't do it. If you think it's just somewhere you can park yourself for an easy ride for a few years, again don't do it. If you can't accept that most of the time you won't be playing your favourite numbers, don't do it. If the guys in the band are not good players, don't do it.
I haven't played a boring cover yet, but average and disinterested players can make anything sound boring, trite or just plain dull.
Play them properly and most covers, certainly the ones that audiences like and want to hear, will sound good, even Sex On Fire and Mustang Sally.