For any lvl 70s who are planing to solo him, here's a strategy:

First make sure that you bring lots of potions, make lots of bandages, written a will, and tell your family that they may never see you again.

Next, run to his area.

Then when you see him, after the fabric of reality becomes torn apart and you begin to question everything you have ever known, push alt+F4, log onto the WoW website, cancel your account, and pray he doesn't know where you live.

Here is a screenshot of him I took before he killed me and the 4 raid parties that gathered to kill him.