+1 at duels actually being fun now.
Invulnerability isn't bad for FFA. I think it's a cool dynamic. In duels it would be worse than the shield gun at it's worst.
Gameplay wise, I really love everything but CTF. Honestly even though I love the game, I find it easier to pinpoint what I don't like because the list is smaller.
Who do you duel with T2A? I haven't picked up anything from the scrim bot yet, though I want to, but whether in pub pickup, or duel server idling, I've enjoyed all my 1v1's, even when my opponents left early, or we were playing on a non-duel server with ws-on (I liked it less than ws-off, but it was still fun).
I really dig most of the DM maps too. I had my gripes at first, but the more I learn maps like Arsenal, Diesel, and Defiance, they really are classic maps. Very on top of them selves, Arsenal still surprises me, as I learn quickest routes from A to B.
I dig warslaught too. The objectives are a good combination of useful, but not game breaking, the vehicles are not perfect, but much better (barring the sound issues), and the orb brings some interesting strategy to the table.