I have a Fire/Storm I rather like.
Fire Blasters have a well deserved rep as debt magnets. They do big fat AOE that burns and stings and pisses off mobs.
With my Corrupter I still piss things off, however, I have tools for protecting myself solo or team.
Rain of Fire+Freezing Rain+Scourge is utter devastation. Add snow storm with some +slow (and/or +slow in freezing rain) and the mobs have a lot of trouble getting out of the ROF, stay grouped up enough to be hit with Fire Ball, Fire Breath, or whatever.
Hurricane can be slotted for additional accuracy debuff and procs with other debuffs.
Still having trouble with those pesky bad guys hitting on you? Toss out a tornado or two along with a pair of Lightning Storms.
Storm has a pretty neat mixed bag of tricks -- a lot of 'soft' control, strong defenses, debuffs (Snow Storm, Freezing Rain, Hurricane, Tornado - you know tornado debuffs defense and stacks with FR, right?) and lastly some solid damage if you want (Tornado and Lightning Storm).
It doesnt stack the way other sets do but IMO there is synergy of a sort gained by survivability, +damage from debuffs, and +damage from it's outright damage powers.
Storm is a late bloomer and if your going to team you need to learn when and how to use abilities in a way that does not piss off team mates. Solo however you will be the mighty master of the battle field.
Of course this is just one mans thoughts and oppinions :)