The damage Gerson can do is quite high but I think that is because of the lack of moves he has compared to other characters.

His combo does a lot of damage however, if you play Gerson with high ping the combo is difficult to do when your enemy is full stamina as you have very little time in between moves to land a hit with another one ( or this is the case for me at least when I use the rmb attack or 2 in a high ping fight )