>>108661773unironically was actually handled good
while Rigby got his girl, mordecai decided to focus more on himself and figured the right girl would come along on her own. he stopped being a spineless bitch and grew up same with rigby
I think Regular show's ending was perfect, everyone moved on with their lives and despite Mordecai ending up with some literally who basically shows that the right girl will never come the first time, it was handled better than Adventure time basically since birdbro learned from his mistakes