I. Love. Defender. I really really do. It makes me laugh when I pop open the 'safety bubble' ,as I call it, and confuse the enemy in PvP. It's especially good for Control. If you're trying to capture B and there are 3 enemy's coming at you, pop up the safety bubble and they have no idea what to do. The number of times they have tried to run in and punch me or shotgun me. I just bop them in the head and laugh. The melee is good too. I think it was on moon I took down 3 guys on A because shotgun, punch, get overshield, kill other two. The way I see it, defender is underrated, by this I mean I see almost no one use it. I get it depends on play style but I think that people just don't like it because 'it no get den kills'. Well, that's just me saying why I like the Defender subclass. I'd love to hear what you think.
Side notes:
-it is also very good for distracting bosses.
-It has a grenade that is odd but effective, it makes a big kind of Void cyclone which is VERY effective on the Cabal with the shields.
-it is also badass when and enemy in PvP shoots a rocket as you deploy the shield.
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It's also great when you go down during a boss and they are camping your body (mars strike tank). Than your teammate runs over, pops his bubble, mid revive and the enemy foes super blast, and it doesn't do anything to him while he is picking you up. Awesome.