Man, this is the most balanced subclasses have been in a while now. In a game of control, a Titan can use any subclass and be effective, and hunter can use any subclass and be effective (but they need to fix arcblade), and a warlock can use any subclass and be effective (although a sunsinger isn't really built for that game mode). In trials, sure, a Titan bubble isn't going to do much, but that just isn't meant to be. Every other subclass can wreck shop in trials.