I find it ridiculous that the first boss is able to one-shot my 56k (plus a 30% hp shield) hp Doomscreech that can tank 140k power teams in Arena.

It's one thing to have a game-mode that is more late-game oriented, but the difficulty on this makes it that by the time you get the rewards for 1-2-3 staring the fights, you're already at a stage where you probably won't need them as much.