Tbh, I've actually found it manageable. If you don't use resi, you're going to be bursted by basically anyone (that much was true in wotlk anyway), but it's manageable. Mastery is just high, and in my experience (playing a holy paladin), I can happily stop a mage doing anything by simply casting exorcism on him (for the 100% less crit chance debuff). Or doing my recent trick of using the naxx FR gear (you can't stack spell pen to counter almost 500 resistance). Most classes are bursty, but I'm sure in a bg of geared twinks vs geared twinks, the result won't be too much different compared to 85 (This bracket is better than 70s, simply because most classes have more tools to deal with the top classes).
I'll agree with the notion that BGs are rather useless, since most if not all end up being a massive, massive GY grind (Although I have had it in reverse from the alliance, although a lot of the decent 80 alliance players have stopped), but you simply need to look at it properly. You need resilience here (if you're solo-queueing, go for high survival against the classes you know can kill you easily). I have yet to be beaten by an 84 in arenas, because despite their damage, they lack the regen/crit/survival that we have at 80, and thus are only a sack of health, of which only blood dks are annoying to kill (get on an 84 that isn't blood for a few seconds and their extra health means nothing if you hit for 100% damage).
tl;dr this bracket isn't as unbalanced as you might expect, certainly no more than 70s is, there's just less players (gear availability)