I grinded for 2 days solid (even worked on both of those days) on early access and got DRK to 50. It was a bit boring, but now that I can enjoy HW as the class I wanted I'm enjoying it much more than if I just continued on with PLD.

I'd suggest taking the class you feel is better in your opinion (not everyone elses) and either level it up or experience HW. Don't settle for a subpar experience with Warrior if you will always wonder what it would have been like playing it as a DRK.

Just a heads up, don't let the downers on the Tank board get you down and influence your decision. There are a lot of people expecting it to be the god tank when really, no one knows just how good each class is at 60.