Not every character needs a full-length combo. You don't need combos at all to win. Slys do more than fine without burst combos, same with Ratchets, Sweet Tooths, Evil Coles, Fat Princess, etc. Stringing a few moves together for large amounts of AP works just as well. Hit confirms on the other hand are what really cause the imbalance of this game.
"The more you sweat in training, the less blood you lose in war."