I'm with Denny on this one as well. Dry, toasty, somewhat bitter, not at all sweet. It's obvious that they're not using German malts, but other than that it's a respectable Marzen.
I'm lucky enough to live close to a German style pub that taps nothing but fresh kegs of German lagers. I'll always choose a fresh German lager over an American equivalent, but I'll certainly try the American version, especially if it comes from a brewery with integrity - like Sierra Nevada.
The Oktoberfest I had was from the Chico brewery by the way.