Nothing beats it. It's essentially a ranged arc blade. You get an over shield, and can use it at further ranges, making it much more difficult to go up against. With blade dancer, it was just a shotgun and melee. Can't do that to people in storm trance. They get you from further range, because warlocks of course get it easy becuase they require no skill. Hell, even sunbreaker takes more skill than stormtrance.
Edit: we passed 300 replies!
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Haha stormcaller here. In pvp when I have my super I can usually take out two other guardians before a third puts one in my brain pan. A single headshot from a skilled player can stop storm trance dead in its tracks. It's happened to me plenty of times.