I think we see a CSS or SF look-alike almost every month, don't you think it's getting a bit crowded for these games?

CSS + SF =?

The reason for this is that they sell.

A company will put anything out if they know it will sell.

SF? SourceForts? :D

Why is this general gameplay exactly?

If you look at some of the highest game sales of all time they mostly consist of CoD and other shooters. Marketers are stupid and only see the money. So the marketers tell the designers that the company wants shooters or your fired. Then the designers try to make a new game made of mostly old and well tested ideas. Then when the "new" game is shipped out the gaming people buy the game, no matter how much of a clone it is. Now, because people bought the game they make at least fifty remakes where very little changes. All of this is pissing off the people who are now bored of the clones, but the markets only hear the consumers.

So here is our problem. There is no way to deal with this. If we don't buy others will. And if we do buy they will make more.

@Drewgon
Oh fuck man that's really true. I remember there was a F2P FPS vs. RTS-style game called Battleswarm: Field of Honor. Sadly the company ran out of funds and they had to sell it to another company for kid's games. And since the game wasn't intended for minor ages, they had to shut it down.

Conclusion:
every new fantasy multiplayer game is a rip-off of world of world craft and every new FPS game is a clone of call of duty (not counting AOS ofcourse).
modern multiplayer game indiustry SUCKS BALLS!
The only good multiplayer game that I know that got an original gameplay and original ideas in it is mount&blade (thanks god for manual sword and bow attacks, tough i have to say its not FPS or a fantasy something game ).

Battlefield 3. Forever.

Battlefield 3 FTW, man.

I have to agree. There is actually one game I've seen just recent, Mission Against Terror, and I must say it fits the bill of a stand out game. It has nice, crisp graphic environment and smooth game play, not to mention a good storyline.