He and some friends played a game the other day. Here, in his own words...
Other stuff I've seen from people analyzing it...The Good points?
It's much much easier to run and design encounters.
Also: There are no dead levels.
Also: You will never just spend a whole encounter repeating the full attack action.
Me: Okay. Any difficulties?
Him: Plenty.
Ok..
So one of the big problems I've had so far is everything is becoming very specialized.
Classes have specific roles in their description
Striker, Controller, Defender, and Leader
And if you're not THAT CLASS.
You're pretty much incapable of doing that job if you need to.
I had a problem, a big one, Tanking as a Warlord, which is a Leader.
And with two leaders and two strikers we had absolutely no battlefield control at all. Party balance is extremely important which leads people away from playing what they like.
Well, it seems to be not nearly as customizeable, monster HP increases faster than your ability to do damage does at each level meaning combats get long, utility spells are considered to be things like 'expeditious retreat' which don't directly do damage to the enemy, and...oh, I could go on.
On the good side, even the people pointing out the flaws admit they'd play it as a social session with their friends.