Well that's because you spec SV. You can try MM spec just for fun. Whean I get real bored I spec MM and I enter BGs. With SV spec I normally do the flag carrying but with MM forget about it. MM class is very fragile and all other hunters will eat you alive. Never the less there is a very good reason for doing it. You will one shot people for more than 60% of the times. Aimed shot will devastate most of the enemies making you the highest priority to be killed. I believe that aimed shot with "Rapid killing" and "Carefull aim" = win. Combined with zerger is rofl 2k crits.
I play a 24 sub rogue. Without any berserk buff I've managed to hit a 1k crit on a paladin inside of a battleground. In a dungeon I hit a 1.1k crit ambush followed by a 450 eviscerate.