I kinda like the spell Ice Storm thematically, and it would fit well into a character concept I was tossing around. I have noticed, however, that the general consensus of the spell is that its... okay. Not terribly bad, but not terrifically good either.
That being said, I think the spell lends itself rather nicely to some creative optimizing. For example, Rime Spell metamagic. This would cause the spell to also entangle any creature that receives the cold damage from the modified spell, with no save against the entanglement.
This seems particularly nifty to me with Ice Storm. Provided that the affected targets aren't particularly resistant to cold damage, everything in a 20ft radius of the target spot just got ensnared for 4 rounds... in the middle of difficult terrain! With no save. That sounds really nasty to me.
Combined with a trait like magical lineage, it can be given Rime Spell for free. (I'm not sure if the rules agree, but me and my DM agreed that ML should be allowed to select any spell you intend to learn, and not just one you already know).
I'm considering either witch or druid for the concept that I'm envisioning, leaning more toward witch for those fun little hexes. If you can't tell, I'm going for something of a controller, who enjoys ice spells (naturally I'm dumbing it down because I don't feel like explaining the character's roleplaying concept xD). Is that little strategy of mine warranting of the spell slot (and the trait)? Or do I have better options around that level that I'd be better off with? Any advice would be greatly appreciated. ^^