You know, I was actually thinking this would be a well-discussed "over-the-top" power. This thread was all I found.
My players have just hit paragon level, and the cleric feels compelled to take the paragon class for this power. I can't blame him. He's getting a huge area of effect and inflicting damage equal to a cleric daily. On a controller class, this would be pretty potent. On a leader, it's just too much, as a quick comparison .
The real kicker is that Solar Wrath lacks the implement keyword, and upon that realization, the power suddenly seemed more reasonable. It becomes a nuke with bad targeting. So imagine my eyes rolling when I check the errata, and sure enough they added the keyword retroactively--and didn't do anything else to rein the power in. This strikes me as the same kind of errata as the skill challenges, traps, and hazards received--not really the result of a typo or an editing oversight, but rather some designers going back and hastily changing things.
Long story short, I'll probably ignore the errata.