As a quarter-decent drummer myself (basic learned in the school orchestra, self-taught from there) I have had a life-long interest in drumming and drummers (orchestral, military, jazz as well as rock). I have seen – live – almost all of the top bands from the sixties including the Beatles, the Stones, The Who, The Move, The Kinks , The Animals and many more. I still have my ticket to see The Who at The Marquee in, I think 1966 or thereabouts, price 2/6d (twelve and a half pence).
There is no doubt in my view that the most talented and accomplished of the rock drummers I have seen is Keith Moon. “The Loon” was almost entirely self-taught (though I believe he did have a few lessons when he got his first kit) and his eccentric lifestyle translated into an unconventional and extremely entertaining technique on the skins. Moon invited himself into the Who when watching one of their performances in a local club (in Harrow, I think) by telling Roger Daltry that he was a much better drummer than their current member, Doug Sandom. There was nothing lucky about this. He had targeted the group because he knew they were looking for a more exciting drummer to further their career. And the rest is history.
Among the others, probably Charlie Watts is the most technically accomplished (and long-lasting!). The talent and ability of many of the others varied considerably. In many respects a number of the successful Sixties band members could consider themselves “lucky”. They were in the right place at the right time and took their opportunities as they arose and Bev Bevan is probably among them. Many of them were not accomplished musicians (probably the best "musicians" in my view were Brian Jones and Alan Price) but they didn't need to be.
I would not knock Ringo as a drummer. He too took the chances offered to him and he was extremely successful, and good luck to him. As to where he sat in the drummers’ league table, he was, in my view, a “plodder” and simply provided the back-beat for the Beatles’ songs. Nothing special and I (and many others) could probably do just as well. But I could not even get near to The Loon for talent, ability, and pure entertainment. I certainly don’t think I would have put explosives in one of my two bass drums (or, for that matter, even attempted to have played a kit with two even if I could have afforded it). “Mad” Moon was a one-off. Unique, flamboyant, just great. The lucky ones were those of us that saw him perform.