People are mad, and will not heal and or take you in a group usually.
Basically it's like a sniper shooting somone in an angry mob, with no leader. Yeah you can pick one off, but there is still like a thousand left, and once they see you, you better run!!

The sin in pvp
I was watching gvgs all morning and i can say, yeah that looked perfectly natural.
The sins used AoD, beat the crap outta the target and ran. It wasn't one big unruly mob where horns of ox seems almost useless. It was actually pretty intresting seeing how the great combos that you want to do, work in pvp and don't in pve.
I think i might go pvp, i love my sin, but i still need to cap AoD... but either i am just saying they could work, but you pick off one part of the mob and more come, which is why some think the tanks that can keep rollin rollin roollin are better suited for the job.
Note* i dont mean to anger anyone, i like sins as much as you do, but i also can see that factions and those bloody pleague people are stacked against sins..