That's true.
Frankly, unless you put a large amount of thought into it, you can't design a decent game. A hybrid space combat/first person shooter would need TWO different game engines. Unless you're comfortable paying $150 a game, it's just not feasible.
That's the way it is.
And Frosty, it's because much of the general public is rather, well, ignorant. 40% of the general public thinks we didn't land on the moon (we did) and about 85% of the public thinks we only use 10% of our brain (only special people do that...brain-dead people). As a democracy, we are by nature fragmented and uncertain of what we want. To a lesser extent, gamers are the same way...you can't make an omelet without breaking a few eggs. Some people complained about Prophecy, especially the lack of multiplayer (to which I say: "What are you complaining about? They give you this great game that you enjoy, and you COMPLAIN?! They have the right to complain, not you!")
Agh, I'm getting too philosophical.