would i be late to the party if i wanted to try Aion?
I'd say not really, they released
Aion Vision and TBH its pretty legit, but I dropped Aion after the huge decrease in population,
IIRC it started with around 40-ish servers and the zones were instance-based (if a zone was too populated, the server automatically made different instances), this was kind of good and kind of bad, since it means there was a lot out-world raids and dungeons, which are pretty legit and add more fun (challenge) because you're fighting against other groups to get that boss. . .
but on overpopulated areas there was some sort of instancing, anyways that doesnt happen anymore
the population dropped to 4 servers, inflation went up like hell, I cant afford anything and prices just keep rising, things that were for lvl 30-ish are now un-purchasable unless youre on a smurf account. . .
but if you dont mind not being part of the "economy" I would recommend it, the Abyss is such an awesome PvP experience. . .specially if you do fortress raids. . .they are the most fun shit ever. . . you have to drop your graphs to super low in order to have a battle of around 100 vs 100 players all packed into a castle. . .