Jheem:
The Sex Pistols played their own instruments, albeit poorly at first. One of the basic tenets of punk rock was to go ahead and get out there and play, even if the talent wasn't yet up to snuff. It was in reaction to the overblown excesses of stadium rock at the time. Now, whether or not they were worth listening to is a question of taste. Me? I loved 'em!

Edit:
Oops! I don't think I absorbed your Pistols post before I reacted to it. My apologies. Touchy subject for this aging punk rocker.