It has nothing to do with the leveling experience which is great. It has everything to do with the fact that the developers seem to have no experience in dealing with MMO's.
1. No economy in the game.
2. No FUNCTIONAL/NECESSARY crafting system- besides biochem
3. poor content implementation, buggy encounters, badly designed UI. Broken quests.
4. poor customer support.
5. advanced classes sharing the same story line
6. EA****
7. no community due to lack of server forums.
8. No looking for group mechanic
9. Multiple loading times for entering a planet. After the 100th time you just never want to zone 3-5 times to get somewhere.
10. No competitive PVP system
11. poorly balanced PVP mechanics
12. poorly designed guild system.
13. poorly designed UI
14. Lack of combat logs, events, tracking. PEOPLE want to see big numbers and track their own progression
15. Overall arrogance of the developers.