It’s not the grind; people are forming many groups all the time and even specifically for killing.
It’s not the graphics; while very nice, they don’t make a game good or bad.
It’s not the money; the sub is at a reasonable level and in-game gold is not that hard to come by.
It’s not the bots; a little patience and planning and you can even have fun with them.
It’s not the limited flight time; there are many ways to work around that and gliding is much more fun and useful anyway.
It’s the crafting.
I cannot stay in a game that treats crafting as the best way to eat away at your money, that handles crafting of powerful items on a twice random roll (crit the first item and then crit the second to get it – leads to me making 48 gold rings to get the two rings I wanted).
I would understand it if it was HARD to find the mats. I would understand it if the items produced were so powerful that they could be sold for any profit (instead items dropped are very close to those made and as loot they are cheap to buy or find). I would even understand it if there was some justification for it (Vanguard system or the likes).
So yeah, I stopped Aion because I didn’t like the crafting, but that’s just me. Since it was there I wanted it to be good, and to me it is not. It even managed to piss me off.