You really should try out a few classes on Blackrock. At least try one from each of the following categories: melee, range, and stealth. Each of the aforementioned category requires a different play style that may or may not suit you. I prefer melee so I have my biases: I believe ret and BG are made for each other. All the stuff they don't let you use in arena (nitro boost, bombs, healing injector, free action potion, lay on hands) really turns ret into something quite different. But I'm sure you can make a similar argument for other classes/specs.
Also, keep in mind that even among different melee classes, the play style can vary. I find it best to play ret in a more defensive manner (much like a front line assassin). If you charge in like a warrior you will get owned and you really need to pay attention to where you stand, and try to predict which way the battlefield is shifting (know when and where to push, and when to retreat). If you get caught without any support, unlike DKs, casters will nuke you down in a hurry. Oh, and save your wings for situations where it can really make a difference. Don't waste it on the first pleb you see.
One final thing: I disagree with Greedman45's claim about ret's dependency on gear. My experience is that ret is no more gear dependent than other classes. Not by much anyway. I play 7 rets ranging from 4k to over 6k gs, and I enjoy playing on all of them. You just have to be aware of your capabilities and limitations, and switch to support mode if necessary (eg, babysit a warrior, be a cleanse bot for someone fighting a DK/mage).