It's not teh-ub4r-pwnzorz, and on this forum if it's not uberpwn, it doesn't tend to get much love.Never seen anyone use it.
Is it really that bad?
I like to do that in normal, if my build has it as pre-reqLol must be hilarious to see andy walking in circles over the fire.
Yeah, a Firewall/Blaze/Orb Sorc should be very much viable. As Noite says, the biggest difficulty is stationary monsters. Good luck trying to roast archer-types with Blaze (it's doable, but it's a lot of work- you have to lay fire behind them, and then chase them into the fire, and then back off and let them roast). Firewall and Frozen Orb would give you dual-elemental attacks to take care of stationary monsters. You'd probably also have enough skill points left over that you could boost your TK and make a mid-level ES, or else you could even synergize the Frozen Orb.I like to do that in normal, if my build has it as pre-req
One good approach, and someone was willing to try that some time ago, is to have both Firewall and Blaze maxed as well as Fire Mastery. That way you can use FW for stationary monsters. Still grants you enough spares to invest in something like Orb for immunes...