more of the same would only bother me if the same sucked.
left 4 dead 2 was great, fallout 2 was great, starcraft 2 was great etc etc
there are a few series where more of the same lead to stagnation, but usually those series didn't have enough awesome material making up the core experience to warrant more of it.
btw, the preview where they guy was complaining about the demo was one of the worst pieces of journalism i've suffered through. "waaaaa the demo just puts me into the wasteland and doesnt have enough actiony stuff for me to gawk at waaaaaaa" not to mention, he thought fallout 3 was a 20-30 hour game... i'm not a superfan and even I spent more like 60-100 hours exploring the capitol wasteland.