A lot of people in the comments are saying hunters because of invisibility, but doesn't it only last for like 6 seconds? You can't just wait out a war in 6 seconds. And it's not like they're hard to spot anyways. On top of that bladedancers don't get a huge over shield during the super, so it's easily countered. Honestly I think it boils down to Titans vs warlocks.
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With blade dancer ability that immediately restored health for each kill you could easily take out 20 grouped up people. But on the other hand a hunter running the ability that makes it last longer for each kill you could easily stealth around them and take out 50 from behind
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I seriously doubt invisiblity lasts for six seconds in reality. Pretty sure it's just for balance purposes. Imagine being invisible the entire game! That'd just be no fun! [spoiler]throwing knife FTW[/spoiler]