Originally Posted by
Filth the Warlock
If you're playing casually, then play whatever you prefer or if you must, whatever gives you the best results.
If you're going for a more hardcore playstyle, you should read the stickies to make sure you don't miss out on all the crucial information in those.
All specs are good, but they're good at different things and excel further at even more different tasks and playstyles. They can all be used for everything, but as I tried to point out, they don't all do everything equally well.