I like you Birdy, you're a good poster but I'll never understand you rate this bum.
Dembele's just extremely polarizing. All around great dudes rate this guy, not just Birdy. Reminds me of that Potroh guy too.
Maybe it has something to do with what he could have become based on his Dortmund season (honestly, the Dembele we currently have is a lot more like his Rennes version) rather than what he shows on a regular basis. Plus, the fact that we don't have any other quick wingers so he really does add something different on the virtue of just existing despite being awful almost every time he plays. He's also a stark contrast to the slow and methodical Barcelona prototypical player so many of us have come to hate, so it might be a matter of ideology getting in the way too.
That's my rationalization. No way a brother can watch Dembele fuck up passes, touches, not being able to dribble (unless there's 20m+ of open space), not being able to shoot, and move off the ball and say "god wow, he sure is incredible."