Yes, Khan was very talented and gets unfairly depreciated a lot because of his chin + likely some ppl don't like him as a person out of the ring. He was a very good fighter at some point and by no mean a bum.
It wasn't a brawl at the beginning when Khan landed a well timed body shot and put him down. I think Khan could have made it easier but i think he lacks the ring IQ to truly implement a gameplan where he can go to plan b. Maidana would always be a bad matchup stylistically for Khan. Shawn Porter would also be a horrible matchup. Khan, Maidana, and Porter have one thing in common which is they're all predictable. The difference is with Maidana and Porter is they're much more durable than Khan and can take a punch much better.
I couldn't believe he mopped the floor with Zb Judah as well. . I thought Zab was going shatter the chin