This is a good, average beer. It is certainly better than a Bud Light or most theme park offerings. It's a theme park so I wasn't too taken aback by the 9.05 (plus a tip for "Moe") for a 20 ounce draft. If you're a Simpson's fan and happen to be at USO it's a must do - the theming is quite good.
With regards to taste, regular Duff is a lager, most comparable to Heineken, while Duff Lite is a light pilsner beer, similar to Miller Lite. Finally, Duff Dry is a creamy stout, like Guinness.