Dave Chappelle -- QUIT BITCHIN ABOUT THE FIGHT ... It Wasn't That Bad!

Mayweather vs. Pacquiao wasn't a rip-off ... it wasn't a let down ... it was a PRETTY GOOD FIGHT ... so says Dave Chappelle.

Dave -- who occasionally trains at Manny's Wild Card Boxing Club gym -- was out in L.A. Tuesday and told us something that virtually NO ONE has said about the fight ... "I enjoyed it."

So, why did the fight get so much hate from critics?!

Dave says he thinks it's because a lot of people who don't usually watch boxing tuned in ... and "they don't understand that it was a pretty good fight."

"Those guys are excellent."