First Person Shooters on a PC are in every way superior to First Person Shooters on consoles (xbox 360, PS3, etc)
reason 1 - Mouse and Keyboard > Controller : Once a person has gotten used to it, the mouse is much more precise for aiming with than a joystick. The joystick on first person shooter games often have sensitivity caps, and you are limited as to how fast you can turn and shoot at a target. With a mouse, if you were good enough, you could almost instantaneously turn with perfect precision to any target and get a headshot -- if you were good enough, and had memorized your mouse well enough.
You also have many more buttons on a keyboard, allowing for many many more controls, menus, interfaces, options, etc..
The only positive aspect I can think of for a controller is the left thumbstick - it is slightly more superior than the WASD layout, but not by much.
reason 2 - stronger communities: the communities of console games are often described as "more social", this simply isn't the case. The popularity of these console game communities is often short lived, and once its dead its dead. People simply play a game for a few months, then get bored and buy a new one.
PC gaming communities however, live on for years and years... The game Warcraft 3 (came out in 2002, I know its not a first person shooter, but just for an example) still has a very active player base and modding community. Counter Strike Source (came out in 2004-2005 I believe) is as alive as ever, and also has a very active modding community.
reason 3 - modding communities: you never get bored with the same old maps and content, or lack of updates on a PC first person shooter. Users are making new maps and game modes all the time - in very creative and innovative ways. And if the game developers of a PC title have abandoned the game after launch with no hope for updates, as long as the game can have player-made mods put into it, then the game can be saved. Think of all the broken console games there have been - especially back before it was possible to update them.
For Counter Strike Source, there are literally thousands of player-made maps (many of them far more entertaining than developer maps) and dozens of different player-created modded game modes suchs as: Zombie mode (with all sorts of variations between servers/maps), deathmatch, "Gun game", "Reverse Gun Game", RPG deathmatch, Surf maps, prison escape, and bunny jumping maps... just to name a few
