I'd actually say Gunslinger, Defender, and Radiance are the three supers that aren't exactly "instant". You have to play those specials well (imo). Radiance is really good, but can easily fail if you do. Though the resurrect one used to make me mad when I first did PVP. Gunslinger only gives you a few shots, yes they are insta-kill, but you have to hit and have a higher chance of being "taken out". Playing as both Defender and Striker myself for the Titan, I can say that any Defender that thinks bubbling up means standing in there and just waiting... is playing it wrong. There are times where that's what you have to do, but diving in and out to renew the shield as multiple enemies swarm you and still managing to be able to take them out.... knowing when to identify incoming super from a titan or warlock based off their movement... Knowing when to get out of that shield because holy shizer that's a bladedancer charging towards you, and that dome is just too tight of a place to kill the BD...That... takes at least some skill and some luck. Maybe it's this way for all classes though and we just don't know it.