Ive only ever played titan. Sunbreaker is kinda meh - melee nothing special, super too easy to avoid (just jump around if they're aiming at you). Hardly ever play this subclass. Defender can be fun. Force barrier helps extend your life by about 1 second when under fire. Bubble can be hilarious but it's too easy to smash, leaving you exposed. Play this on control sometimes, mostly PvE. Striker. Ah, striker!! Strap on some stand-asides and it's awesome to run around for what seems like a lifetime OHKing people and then FoHing one, two, however many people you like. It's FUN. Don't nerf it. Don't spoil my fun!