Allow me to use a textbook example of the one competitive multiplayer FPS I genuinely enjoyed. That would be Halo Reach, which I played the multiplayer of for six hours at a launch party last year. Note that I won't touch on the campaign - for an example of how to do that right, look at something like Half Life 2. Iron sights optional, but you look more badass shooting perfectly from the hip.
*ahem* Back to Reach. Allow me to list a few things that Reach has that it's often accused of not having:
-Regenerating health - well, not exactly. It had regenerating shields, and there were still medkits around for your health (in some of them, anyway.) It also has a health/shield meter in every game, rather than spraying ketchup all over the screen. Besides, how is waiting for the bullets to fall out, the holes to close up and the ketchup to wipe itself off "realistic"?
-Interesting weapons. Allow me to list some weapons from Call of Duty: Modern Warfare: Six assault rifles that do sliiiiightly different things but aren't similar enough to share bullets, five sub-machine guns that do sliiiiightly different things but aren't similar enough to share bullets, three light machine guns that do...you get the picture. Halo has the Spartan LAZOR!!!!, Needler (homing), Energy Sword, a grenade launcher with grenades that go off when you want them to rather than the instant they hit something...
-Colour. This is something Halo takes a lot of flak for, and I honestly don't see why. If Halo was nothing but grey and brown, why is the Machinima named "Red vs. Blue" rather than "Brown vs. Grey"?
Can't say anything about the campaign of any Halo games, but that's my take on its multiplayer.
*ahem* Back to Reach. Allow me to list a few things that Reach has that it's often accused of not having:
-Regenerating health - well, not exactly. It had regenerating shields, and there were still medkits around for your health (in some of them, anyway.) It also has a health/shield meter in every game, rather than spraying ketchup all over the screen. Besides, how is waiting for the bullets to fall out, the holes to close up and the ketchup to wipe itself off "realistic"?
-Interesting weapons. Allow me to list some weapons from Call of Duty: Modern Warfare: Six assault rifles that do sliiiiightly different things but aren't similar enough to share bullets, five sub-machine guns that do sliiiiightly different things but aren't similar enough to share bullets, three light machine guns that do...you get the picture. Halo has the Spartan LAZOR!!!!, Needler (homing), Energy Sword, a grenade launcher with grenades that go off when you want them to rather than the instant they hit something...
-Colour. This is something Halo takes a lot of flak for, and I honestly don't see why. If Halo was nothing but grey and brown, why is the Machinima named "Red vs. Blue" rather than "Brown vs. Grey"?
Can't say anything about the campaign of any Halo games, but that's my take on its multiplayer.