It’s easy to be underwhelmed by Barry Harris if, for whatever reason, you have neither taste and/nor ear for the subtleties of bebop harmony. That was me until I really got into the specifics of playing bebop (a pursuit which never really took hold because as much as I loved being in the room with it, when I got into bed with it, I felt like I was with somebody who deserved different from me, they deserved deep knowing intimacy, not just naive worship). My casual impression was that he was “just” a really good Bud Powell disciple. But...even if that is ultimately true, his knowledge runs deep. Very deep. Very, very, VERY deep.
All of which just to say, Barry Harris can play, really play, but if it ain’t for you, don’t blame him, because his shit is right.