Why is there so much Banana Guard hate? Asking as a new player

So I just started playing the game (horrible timing, I know), and found Banana Guard as a fun character to play, racking up a decent winstreak in 2v2 PvP. I was curious as to what the community thought of him, and am surprised by all the negativity around him. Is there any other reasons he's so unliked? Or is it just that he's a "wasted slot"?