In epic play this melee/caster build will perform well. Casting ability (unlike almost every melee/caster build proposed for sorcerer to date) is not gimped and good. For me that seems pretty important. He can still drop a good wall of fire and hop to the perch or behind the line for the dull burn down wait like other casters.
The other option for the typical caster in epic is to essentially turn into a wimpy wizard and chuck out crowd control like Mass Hold Monster. A hold monster will not last forever, however, with 5K to 15K hitpoints on trash mobs, power attack can be very useful. So instead of falling asleep behind the lines dulling tossing out the occasional wall of fire and hold monster, this tune can actually help out slaying things when the occasion rises (held things especially).
In my opinion, so far, this is the best melee/caster build I have seen.