Basically, he's a hack. Technically poor, boring plot, detestable characters. Too up itself to serve as enjoyable pulp.
If you're looking for fantasy with some kind of creativity or intelligence behind it, I'd recommend Swanwick, Nicholson and Mieville. Assuming you haven't read at least one of them, which seems fairly likely, that should do you for a while.
“Socialism never took root in America because the poor see themselves not as an exploited proletariat but as temporarily embarrassed millionaires.”