I've been waiting for this free weekend for awhile, and I've really enjoyed the game. Ill for certain be purchasing it by the end of the weekend. That said, I've always played plate classes, preferably with 2hers, in all the MMOs that I've played. Everyone and their mother has said how OP Warriors are and it seems everyone I run into is a Warrior, is a Greatsword or Hammer Guardian at all viable for group content at max level? I know GW2 isn't WoW in the way it handles life at level cap, which is completely fine, but it seems that a lot of classes get left behind if you're not a certain class/build.
No class is really needed since no one has roles other than DPS except for the guardian. He's the jack of all trades, with mesmer and warrior right behind them for massive DPS boosts. All I gotta say is be happy you rolled a guard, and have fun facerolling your way through Tyria.