It should be no surprise to anyone that every profession can fill all of the role, just in their own unique way. Each profession has a very different identity and play style all its own and everyone should find one that suits there play style. The problem is that many of them are very different from what we have seen in other MMO's and some players may have a very hard time choosing one based on his or her personal play style. I know I am.
I usually play a very tanky character with light support. I like a character than can get in the thick of things take a few hits and hit back but also fall back and give support when needed I just don't want support to be my top priority. I also love the imagery of the Knight, but that's minor of course. Just from what I have played in the BWE I still don't know if Warrior or Guardian is more suited for me and I have gotten to 20+ with both!
I have seen many lists of what a class does and what the profession's are, but i have never seen one about how a class does it or what it feels like when playing it. I would like to start one by having people who have gotten a lot time on certain professions to give your overview of it based solely on play style. Compare it to other games, multi or single-player, if you have to, or use real world analogs, what ever you need to do to get the point across.