This is really off topic now (Should be in pilot's lounge). But if you wanna kill some time without paying too much money, and you already have a COD monster-rig you should look at some of these titles:
ARMA 2 + Operation Arrowhead (Combined Operations)
- The default game supersedes most infantry/tank/aerial shooters out there, and emphasizes tactics and realism more than most "popular" shooters (like the battlefield series, modern warfare, rainbow six). But to get the full realism potential out of it you need some mods (btw mods make arma what it is. The ultimate sandbox warfare sim - you can have russians fighting clone wars troopers from starwars, or pilot an A-10 strafing taliban IED teams).
The mod for me is A.C.E. - Advanced Combat Environment. It adds a whole bunch of weapons, vehicles and features whilst removing nearly all "HUD" items. It adds wind deflection, and for long range sniping you can adjust the sights by measuring wind strength and direction. Add on top of that the mod called ACRE (Advanced Combat Radio Environment) which coordinates teamspeak with ingame radio systems. That means the game decides who hears what over teamspeak, and that through the use of radio systems. They all have frequencies etc even volume buttons. The cons are that if playing online there's a little (sometimes a lot) of visual LAG. Players seem to jitter around, so does vehicles. But you can live with that mostly since a lot of situations depend on the way you approach the objective. It's not meant to be a close quarters hair-trigger battle, but a long range tactical engagement where surprise is the best attack.
This mod is very well coupled with a realistic soundmod and then you have very very very good immersion. Also has a powerful editor that lets you create your own or tamper with existing missions. Just made one where you start inside a C130 at 15,000 ft and choose your equipment from some crates in the cargo hold. Once you're ready you run off the ramp and that initiates a free-fall dive. Of course you need to remember to pack a chute
Speaking of tanks the armor code is very good in ACE. You can penetrate light armor and houses, walls etc with .50 cal, taking out crew or ammunition storages. Some guns like the one on the Bradley IFV have a variety of munition types, so you can fire Armour piercing or High explosive. High explosive deals more damage to soft targets naturally, whilst armour piercing can punch through even heavy armour. The angle of impact and location and projectile energy all count towards what penetration value you get and how this damages the interior of the tank.
Example of bailout sequence with ACE:
Some ACE with ACRE teamwork
Then there's another timekiller:
SPAZ, Space Pirates And Zombies. It's cheap and has hours of fun packed into it. It features a decent selection of ships and equipment with loads of configurations. It's only in it's first release candidate and havn't encountered any bugs yet, but it's easy fun!
Rise of Flight:
Naturally a pretty flightsim, in no means a "rival" to cod because of the scope of the games. Sometimes WW1 is like fighting with sticks and stones when you know there's an alternative that has heavy machineguns and some real payloads in the bombbay. It's my "deathmatch" type game, whilst IL-2 is more serious to me.
Mount and Blade:
Played this for hours and hours. Big sandbox world with a handful of factions. Whoever is at war or are allied is completely random by default, but can be influenced by actions of the player. It's a "300" style game with slaughtering up close, or from a distance by archery that includes a large RPG level up system with plenty of skills and proficiencies to choose from. I am currently one of the "viking's" faction most trusted warriors and kindof singlehandedly obliterated two factions already. You travel the country, embark upon quests and gather food, trade and recruits along the way. There's random Tournaments with different styles according to the local culture etc. Graphics are kindof mediocre, but the ability to switch between first person/3rd person allows for great immersion. Also many good mods out there.