I voted a 4, because although within the business model, sometimes prices are a bit up there, it is just that, a business model. If it's working for Aeria, then good for them.
In the past few months, I've played Digimon Masters Online in which Hadouken was regularly helpful in the shoutbox with trying to help discern the server issues to forward on to joymax (and when you partner with joymax, you can expect issues
) and Scarlet Blade, in which any tickets I've submitted have been resolved in a very timely manner. The game is still new and there are a large number of issues to be expected, both in and out of beta. To expect perfection is too much for anyone to ask for.
I have been playing online games for about a decade now and have dealt with far worse companies. I won't name them, but I've had a company ban my account and repost a tech work-around guide as their own. I've also seen games thrown out the gate when they should still be in closed beta and start throwing in cash shop when the game(s) itself/themselves don't even work properly to begin with.
Aeria meets my expectations for a game company in the F2P market. I wouldn't give it a 5 because no one's perfect, but any issues that can be resolved by reasonable means have been, and those that cannot be resolved, I can think of reasons as to why that could happen.
Coming back to Aeria for games from another host who recently lost a game due to litigation towards the developer(which have been trying to be straightened out for the better part of almost 3 years now i believe), I have learned more about the hoops that game hosts and publishers actually have to go through and therefor cannot rightfully give Aeria any less than a 3.