In terms of Aeria Service, I gave a 3. GM/GS events happen regularly, although since server merge I have got frequent slowdowns and DC's. I haven't submitted any tickets so can't comment on that.
In terms of the only Aeria game I play, Scarlet Blade, I would rate 1-2. Item Mall prices are insanely high. The game is P2W, +9 enhanced and above and unique gears are too OP, no one who doesn't spend a TON of money on the game frankly doesn't stand a chance, leaving the game with a 'strong get stronger, screw everyone else' feel to it.