I'd started with The Girl With the Golden Eyes, which proved very disappointing (and somewhat baffling).
But then I tried Pere Goriot, which I happened to already own. This was much better. The first was so over-wrought that I couldn't imagine why anyone would term him a realistic writer, and generally distasteful and shallow, to me. With this, yes, I could see why he was considered realistic. This is broader, more complex, far more interesting. But pretty depressing, to put it mildly.
I think I'm going to go for a third, Cousin Bette, based on a recommendation here.
:)