rex splode

in the animated series, why did they make rex splode look so weak and pathetic? I've seen him do some serious damage/large explosions throughout thr series and everytime there's a fight it's as if he's throwing napkins at everyone and can't aim for sh*t

I like to think that if he surpassed all those potential candidates for the guardians and was officially accepted into it then he must be pretty strong atleast.