When SL started, I play 2-3 classes. My favorite 3: MW monk, (now) R Druid, and Rogue.
I like all 3 specs of rogue in general but find Assassination the easiest to play in fast paced PvP settings. But when SL began I qued into a BG as Sin Rogue and was called out by a teammate in chat for picking Sin. I was asked if I was trolling. Sin performed so much worse than Sub Rogue (Kyrian), that anything else was so bad that it was a troll pick to say to my team that I am throwing this game because I am relatively useless.
The teammate was not necessarily wrong either. Now in SL 9.2, all three specs are considered good in PvP. No one trolls any rogue for picking a specific spec.
In fact, I don’t think anyone complains about anyones spec pick in random BGs now.
DF really needs to take the time to avoid this level of imbalance. If the release day was in November, then push to early December if required, or even the last week.