Here's my two main reasons why I stopped playing.

1. I was getting tired of looking at AV's content release schedule and being constantly disappointed.

2. Sieges were my favorite part of the game and I could only get 1-10 fps in them.

The game was some of the most fun I've had in a mmo though. I would want to play again if they released all the content and if I was able to upgrade my PC.