I know Del Shannon isn’t held in high regard amongst Rockers, but Tom Petty liked him enough to produce his 1982 album Drop Down And Get Me. As for The DC5, they rocked much harder than did The Beatles. I have and love four of their albums.
Another act not getting the respect they deserve are ABBA. Bjorn & Benny are fantastic songwriters and producers, and they made superb Pop music, almost the equal of Brian Wilson. Speaking of Brian: Dave Alvin admitted a few years back that he never "got" The Beach Boys until recently. Took him long enough! Paul McCartney still considers Pet Sounds the best Pop album ever made, and "God Only Knows" the best song ever written. I agree with him about the latter.