I didn't know he was highly regarded here, but I'd wager that it's because he's a warrior. We've watched his evolution and it's super admirable for a fighter to evolve the way he has. And he's just an all around fun fighter to watch.
As far as your efforts to diminish his accomplishments, I've been on sherdog long enough to know how to do that for any fighter. Name a fighter and I can write a quick essay on how they're not really that good. Any fighter. Fedor. Anderson. GSP. Khabib. Hell, name my favorite fighter and I can do the same. It's not that hard to diminish a fighter's accomplishments. That said, stop acting like a casual and just enjoy the violence. Gilbert has been bringing the violence whether he wins or loses for his last few fights.