I feel like the whole game has been ruined for the sake of "fixing" the Arena battles, which are really only a very small part of the game. If Arena was an issue then how about Arena only fixes. Shield being Arena only, nerfed damage rates in Arena only, character classes having advantages over others (ie Scoundrels strong against Jedi but weak against Sith??), max 2 characters attacking in a row before opponent gets a hit to prevent high speed teams from dominating etc. I'm sure there are plenty of creative ways to make Arena more interesting. But nerfing everything is not the answer.
I don't have enough time to devote to 10 minute challenges, Sundays were a long enough day as it was. 24 challenges at near even 5 minutes each is still 2 hours and that's before I do anything else. If I wanted to devote that much time I'd be playing something on a console.