I've been pvping since level ten, currently 24 one bar from 25 and I think it must be said. Sentinels and their mirrors are absolutely terrible in pvp currently and I don't see it getting brighter. two problems(meh three kinda)
1. Only one snare and zero CC powers other then a aoe blind that breaks on dmg later on.
2. To many powers at a low level for a rotation, I shouldn't have a 7+ pvp rotation (ZS, snare, bleed, master strike/Charge if get knocked back->master strike, resnare/slash(depending if I had to charge or not) Pop rebulk, use slash, use slash, Blade storm; ZS, Zen/(that other one), rebleed, and finally spam our focus sink(I forgot the name) and repeat. This is way to much of a rotation for such a low level and it gets even worst later on with moves we have to use while there snared and blinded raising it to a 10 some button rotation at 50.
3.(bonus point!) To add insult to injury, other dps class lets take the SI->Sorc->lightning spec
(I have a level 21 of them) their rotation ranges from 3-5 moves and they dominate other people(save the Sniper/GS)
But to Sum this all up for those who didn't care to read two main points and a rant
-No CC
-To many powers
-Screw ranged imbalanced-ness