My point in coming here was NOT to ask for advice on team building (I've given that up; done that on other posts, never get decent advice anyway) my point was to point out how unbalanced the Arena is.
I have a question for everyone here:
You've spent five minutes to defeat a Champion who will not go down, seeing your team slam their best attacks on it again and again, cursing every time because you were suckered by a troll into clicking on a team with half your team power, eventually realizing you have to surrender the match, and then see the words, "DEFEAT: NO REWARD" for the tenth time in the past day?
Yeah, how do you feel?
I'd feel like I have to do better next time or wait until I have the right champions with the right gear before I attempt. There is some seriously difficult content in this game that might take long time to beat (faction wars level 21 comes to mind) and it makes no sense to get frustrated because of it. Either find a way to beat it, or avoid it until you know you can. It's a game, it supposed to be fun :)