There have been a few games that have landed on local shop shelves, but nothing really to be "raved" about. Generally most games developed around here are played and enjoyed by the community, and perhaps friends and family. Problem is, you've got to literally spend over a year putting customizations in-game, because FPSC's engine alone really isn't that advanced until you start modding it and using things such as Project Blue.
A lot of it depends on the story behind your game, and how much effort you put in.
In my opinion, game ideas that have been beat to death (sorry to anyone who enjoys these kinds of games, I just think it's a bit tiring to see them OVER and OVER again):
-Zombie apocalyptic shooters. Sorry to say, but zombies as a whole are an overused form. Generally the ideas are very limited: 1. Radiation. 2. Some kind of rabies-like virus. 3. Some kind of biological weapon.
-WWII shooters. Sadly, people stopped caring about them when the whole "Modern Warfare" bubble came floating on by. Regardless, there is a small amount of room to expand in the series, but mostly all of the ideas have been the same: Capture this bunker, secure this intel, defend this area, etc.
-Games that deal with nuclear apocalypse. The idea has been beat to death.
-Modern military games. Sad to say, but Modern Warfare generally killed any potential in this field. Not to say Call of Duty is bad, but it's pretty much all the same now. Nuclear threats from Russia, China, etc.
Games that have great potential:
-Scifi shooters. These still have limitless potential, because in the future and in science fiction, anything can happen.
-Puzzlers. Sadly, this is a genre I love. A good game that can puzzle you and make you think beyond what most people would. Portal is a great example. I myself have been designing levels for my puzzle game that I've been working off-and-on for the last year and a half.
FPS's are really a slowly dying form. Sure, you'll get a rare one now and then that blows you away, but I really think most of what can be done already has. Sure, you can add more advanced features, but at the end of the day when the dust settles it's still a FPS. Mirror's Edge attempted to re-invent the FPS genre, by adding unique spins to platformers, however people didn't like the idea of having to actually put any effort in. People want games that do the work for you. While many of us desire more, most other people who don't know how games are developed just assume that the game should be easy enough to beat, and have a Call of Duty-esque multiplayer.
Sadly, FPSC MASSIVELY lacks in the multiplayer area. knxrb has done a terrific job on FPSC IP, but even then, most people who make multiplayer games never really see the game take off as popular. The lack of dynamic features in online combat for FPSC is really limited. Most people want multiplayer / co-op games now. In case you didn't realize, the world has changed to where everyone has to be connected to everyone else all at once. This means that FPSC will have to eventually evolve with the demand.
FPSC is great, but it's getting a bit dated. I love how TGC is working on putting in new features to update it to current standards, but generally FPSC is very dated, the physics are clunky at best, and it's lacking in features that modern games have and people love. Thank god TGC is putting in effort to migrate, but even then x10 was a commercial failure in my books.
I just now realized I've had a typo in my signature for the past 3 years.