"I Love Lucy" was, according to my parents, the best show ever made. I think it's complete schwag. That's where nostalgia gets factored in. I long ago figured out that the memories are better than the old games themselves, and you're better off keeping them on the shelves than reinstalling them and letting the crappy graphics and sound (by today's standards) destroy that memory.
When the idea of an FPS was original, all FPS's were good, although some just better than others. Now it seems like all the base ideas have been done and everything that comes out feels like some combo of the base game types; FPS, RPG, RTS, casual, puzzle, simulation. The only thing the dev's have any influence over is execution and storyline. Some spend their time working hard on those, others stick to the tried-and-true purist approach, which requires the least amount of time and $$ and could see the biggest profit.
It's left up to the indie game builders to find the new genre, to push the limits and find the new frontiers. People driven not by the cash but by the experience and adventure of building something new. New music didn't come from RCA, it came from the bottom where the money wasn't. While the options seem limited, there's more out there, we just have to promote the work of indie builders when we can.