I'm hoping this video may change your mind.
https://www.youtube.com/watch?v=lS0IbQjjPBQ
Bigghandsmcnubbs: [quote]The spike grenade may be my favorite. I don't think people understand how to react to it because it is so rare.
Edit: Also, the defender is the only subclass that gains progress towards the next super while the previous super is active. didn't watch the video, but if you did the high impact sniper trick, you can totally chain bubbles.[/quote]
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I always use defender in PvP if im using my Titan ( so Never lol but when i did use him i always used defender, never liked striker really)