I've played for nearly 3 years never pulled any of the following:
Siphi, Rotos, Krisk, Warlord, Foli, Khymar, Hege, Tormin, Nekret, Trunda, Candra, etc
Yet all I seem to face in the arena (and 3v3) is various combinations of OP champs (these days with lots of empowerments too)
I've managed 1 speed triple roll in 3 years of alot of dragon farming (obviously no quads), so my Arbiter is way too slow
Depsite being on the wrong side of luck with this game I've done alright in PVE, cleared FW, DT hard (apart from that ridiculous Rhino), UNM daily, etc
I dont really bother with the waste of time that is Hydra
The arena has always felt a bit out of reach tbh but I used to manage to farm medals is G4 nicely and progress my great hall (still slower than I would like). Currently it's unplayable and playing it messes up my PVE game (losing the stat boost from loosing my previous tiers)
Dont get me wrong I love the game and dont want to stop playing but the Arena is just pissing me off right now
I really hope you can fix it but bearing in mind this current breakage was a 'fix' I'm not holding my breath