The problem with the Omnipotent Blue Rock books as a setting is... the omnipotent blue rock and those connected to it.
It's hard to compare to the power that wizards bring to the table. In the Sparhawk series, the knights were a bit more approachable because they weren't out of the reach of other knights really. They were bad ass, to be sure, but in the end all the knights had access to their own stuff and the supporting cast was actually strong in their own ways.
Sure you could boil down the Belgariad etc into a L&L game, but you'd need to keep Riva out of it due to all it's connections to the wizards imho.