ICE/STORM is actually very complementary. The only powers that don't really work together are Hurricane and Arctic Air. (Frostbite and ice Slick are not complementary either, but both of them are from the ICE set, so no avoiding that no matter what secondary you choose.) Arctic Air is a great power, if you want/need to get in close, but.......
ICE/STORM has great ranged powers, and those powers work great with the PBAoE defensive powers.
It is a offensively weak power set until you get to the mid 30s, but it is great in PuGs, not to mention regular teams. Ice Slick, Ice Storm, Block of Ice and Chilblain are all great pre-20 powers that can help any team, no matter the foe. Ice Storm and Ice Slick are effectively a ranged AoE Hold available every fight (or more, if the fight lasts for more then a minute). I don't take Glacier (and don't miss it) because of the effectiveness of the Slick/Storm combo. Shiver is almost overkill for flooring the mob's move speeds and recharge times.
Hurricane and Steamy Mist make a great combo. Blasters and other squishies can sit safely in the melee free zone while blasting and controlling away. If you don't move around like a caffeinated squirrel, people start to use the Hurricane/Steamy Mist area to their advantage.
Steamy mist helps keep sniping Blasters unnoticed, and myself safe while traveling in PvP zones.
In melee heavy teams, I'll park myself just so the edge of the Hurricane is touching the mobs while the Steamy Mist is giving the Tank the extra fire/cold/energy damage resistance he needs to blow off any incoming elemental hits.
When the 32+ levels finally arrive, your ability to start adding to the damage output becomes increasing realized. Tornado can cause an ungodly mess, but with Chilblain placed upon a mob that doesn't get tossed away, it just sits and tears through mobs like nothing. Toss Lighting Storm into the mix, and it's like the Wrath of God coming down on you.
With Stamina 3 slotted, I can keep Hover, Hurricane, Steamy Mist, Assault and Tactics up indefinitely. Start tossing powers around and I will run low before the fight is over, but with Hover off OR with Recovery Aura/Speed Boost, END is not an issue.
An ICE/STORM can solo, but it really shines in a team setting. No matter what, it always looks great!