IMO, there is a point where the Beatles seriously sucked... and that was when they first made it big.
They changed the face of music, yes, but *NOT* with their ultra-cheesy songs like "I wanna hold your hand" and "Love me do". I honestly don't think a single (good) artist was inspired by THAT particular phase. It was their later, more experimental, stuff that did the trick
Once they grew out of the corny boy-band-like phase, they were actually pretty good.