You can't compare Lineage 2 to WoW, really at all. They are 2 totally different game styles. I used to play Lineage 2 and I loved it, I honestly liked it more then the time I spent on WoW (I played both games from open beta). The only problem with Lineage 2 is that it acutally took some brains to play, not every retard behind a computer screen could do well at lineage 2. The second MAIN downfall to Lineage 2 was the pure fact on how hard (almost imposible) it was to not only reach endgame but have all of the best gear available, and if you didn't either 1) Use a bot or 2) purchase adena online, it was even that much harder (or impossible) to achieve.
As for the Aion vs WoW debate, I played Aion in closed beta, open beta, and through release for a while. I honestly thought Aion was going to get WoW a good run for its money, but the complete lack of endgame, it really couldn't compete with WoW. Granted WoW's endgame isn't anything to get a hard on over, it is still way better then Aions.