For those of us in higher end alliances, Arena is a prerequisite for advancement in the game.
Unfortunately, and I speak on behalf of thousands of players here, I'm sure, the monotony of playing MCOC's arena is its big detractor. It isn't challenging, and the best term I can conjure up to describe it is mind-numbing.
It can be infinitely better than it is, but doesn't have to take away from the income it gets Kabam.
In an effort to make Kabam aware of the monotony we're put through out of necessity to enjoy and advance within their game, I've this proposal for Arenas to improve them all:
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Mastery Teams. Or a title of the likes.
My idea is to add tiers of incremental point rewards, Mastery Teams being the 3rd and highest tier. For clarification, I've created this image:

In this instance, the 3rd and final battle option is the Mastery Team. The mastery team is Mystic Dispersion.
The idea is that the 3 opponents in the Mastery Team's Mystic Dispersion lineup would all be Mystic Champs with Level 5 Mystic Dispersion, and at least a 5/50, 4 Star Champ at Maximum Signature Level.
Here's another image
to display the concept of incremental point rewards as I mentioned before:
A 3x, 3.5x, and a 4x multiplier. Why the idea is good for everyone, in my opinion:
Every incremental tier would come with the corresponding risk of losing your streak as the difficulty of each tier increases. High risk, high reward. That alone creates an Arena setup that'd bring some excitement, require skill, pit players against their nemesis with the benefit of that nemesis being as tough as possible. It's all-and-all a far more entertaining, interesting Arena.
It also brings an element of understanding to new players and/or players unfamiliar with the functions and use of Mastery setups.
Another option similar (or one that could be added to my concept) is synergy teams. A crit team, for example.
Looking forward to seeing what folks think.
Thanks.