Try all the classes and find the one that you enjoy playing the most. Don't concern yourself as much with which class is currently OP or whatever; just play whatever class is the most "fun" to you. Over the months, different classes will be bottom feeders and then OP the next patch; your chosen class' time will come, so try to just enjoy the game.
PS: And whine on the forums when your chosen class is currently bottom feeding, of course. =P