Baronorca

I have to disagree with your judgement on Rain of Fire, it's not a great power, but it has it's uses. For the solo Blaster, it's a great tool for disengaging from foes. Toss down the RoF, and escape while the bad guys are running from the rain.
Also good when teamed with any users of slow powers. Get the bad guys mired in tar or quicksand, pop a red (or two), hit BU, drop your rain and watch the mobs melt away.
And it's fun! My highest (and only F/F blaster) is L33 EbonFlame on Victory.

Here's another tip, TRADE with other toons. Get rid of those useless enhancement that you were going to sell and swap em for some you can use. Both toons profit from this.