Aion was still ok even until 5.8 (it had a lot of problems, elemental forms were annoying af, unlimited enchantments were retarded, but it was still enjoyable).
But aion died with 6.0, where they effectively removed all the depth of the gameplay to replace it with a brainless skillspam on max atk/cast/run speed.
1.x was a lot of fun, people saying 1.x 2.x had no content are people who spend their lives running instances.
Owpvp is the best content, always renew itself because no 2 fights are similar, and was rewarding back then because AP had value.