I was an Arena Master back in WotLK, quit during cata, and just recently came back. I don't think I'm the best PvP'er in the world, but I do think I know what I'm doing, and I'll say this.
Ret really needs some serious love in PvP. In PvE, I feel quite capable, but in PvP I just feel so weak other than when I synchronize every single one of my cooldowns (wings + ES + guardian). Honestly, the amount of damage I output compared to my survivability only feels balanced when I've got wings up and ES ticking. This isn't hyperbole, I've got an almost full set of PvP gear and a 463 weapon, gemmed and enchanted, and my efficacy is completely in the pits compared to pretty much every other class right now. This isn't meant to be hyperbolic, it's just the reality of the situation.
Again, I do not think I'm the best PvP'er in the world, but as someone who was rank 11 in Vanilla, Justicar in TBC, and Arena Master in WotLK, I like to at least think I'm "above average", yet most of my encounters 1v1 or 2v2 I only win if the other person is noticeably terrible. Frost DK's chew me up and make me look like I'm playing with winter gloves on. Shadow priests melt me while I can't cleanse and even if I do hit them with some lolburst their heals are 100x more effective than mine. It's almost unsettling because I'm used to being a successful turbo-nerd that chews up normal-level-nerds, but now my output makes me feel like I'm playing with one hand.
Having gone straight from WotLK to MoP, it feels like everyone else got significant buffs, whereas we just got "streamlined" with no matching increase in efficacy in either damage or surivability and to make matters worse we have less utility (can't cleanse magic debuffs, can't BoF out of stuns, etc).
I've played this game since vanilla, and I've never been as bummed out with the state of ret in PvP as I am now. I hope you help it out, because I've always thought of my paladin as my "main", and the character I really enjoy playing, but currently the spec is thoroughly disappointing in PvP to the point that I don't even want to queue anymore.
Having played almost every class at some time or another, the best way I can put it for people who don't have a level 90 ret... Imagine playing a cat druid with no stealth, no bear form, and no bleeds. That's what ret is in PvP right now.
Edited by Wutangrza on 10/3/2012 11:45 PM PDT