It's hard to judge, having only seen the 1976 lineup in person. From the clips I've seen of the other Wings incarnations, they seemed perfectly fine, but that's an incomplete sample at best. Joe English was quite a good singer, in addition to his drumming, and I don't think the other Wings drummers were his equal in that regard -- though they never got the chance to sing lead as Joe did in "Must Do Something About It."
R