I have the Bronze Blues too. And I don't just cherry pick easy wins. I do my fair share of fights that I probably shouldn't try, but I have no other option than to take a chance or wait 2-3 refreshes to find a team I have a chance against.
No, arena is NOT balanced, and the mission is irrelevant to the fact that Arena is a big part of the daily gameplay. It currently SUCKS if you don't have some very lucky pulls backed up by months of grinding and lucky gear drops. There are teams in Bronze that have no business being there.
I've managed to dip into Bronze 4 a few times, but it's hard to stay there when I have real life stuff to do and can't refresh 24/7 to hold my spot.
The saddest part is, that most of the teams taking me down on defense are comparable to my own, which means that those or us struggling to get to silver are feeding on each other while all of these overpowered accounts are eating up our refreshes and holding us back.
This is broken, whether the long time players/moderators/developers care to admit it and give it the attention is deserves.
Arena should be FUN. Currently it is not. It is pure frustration.
I don't want easy wins. I just want fair fights!