I also agree... It forces people to work together, not ***** over composition which they have no control over (eventually we'll reach that point), and forces everyone into every sort of role. Tanking, support, damage, and general all around teamplay. Good teams always stick together and generally rape the **** out of the every man for himself team.
I've seen countless arams lost because when people retreat they decide it's 'every man for himself' and don't help other teamates retreat... Then on top of it ***** about how that teamate died.
Eventually ARAM will reach maturity and I definitely could see it being a better game then SR. I don't like SR for all the aforementioned reasons by Diamond. ARAM encourages much more team oriented games focused around camaraderie instead of wandering around a jungle killing creeps and only eventually wandering out.
There is no laning or farming phases which just sweetens things all the more.
Neat leaked info BTW. I don't really see a point in 1-3v3s. Maybe 4v4 will wet someones whistle, but I doubt it. 5v5 is where it's at and MAYBE 6v6, that may reach the point of it being too crowded. It'd make for some great battles though, I'd try it.