How awful is this build?
the role that i use the most has three souls, stormcaller for crowd control and dps, chloromancer for obvious reasons, and elementalist for the summons. i personally like it, it suits my playstyle, but i feel like its not as "legit" as some other soul combos....
Depends on what you are using it for. If its to solo then its okay. If its for group content then you'd be better off with some more specialised roles.
That build sounds like a decent build for AoE if you're doing lots of events and invasions. Even if Pyrolock does similar dps, that build is more fun.