I have 3 Massive Ideas.

1.) A direct copy of the earth, where you can choose where to have battlefield in any era of time: prehistoric, modern, WWII, ice age whenever. And all the weapons of that time period. Armies of up to 500 players at once. You can choose the location by simply tilting the earth and selecting a square land of area.

2.) A zombie survival game, to the next level. Open world with either 1st or 3rd person depending on what you want, with a direct copy of the earth, so you can like hijack planes and travel to other urban areas and blow the crap outta zombies, while keeping alive by getting food and whatnot.

3.) Call of Duty 6: Vietnam. Just cause :D

Weapon Setups:
M4 w/ ACOG
MP5 Silenced
M40 w/ ACOG

Favourite Maps:
Crash
Crossfire
Chinatown
Creek

Most of mine were through the next-gen but here's my list nevertheless.

1.) Metal Gear Solid 4: Guns of the Patriots
2.) Elder Scrolls IV: Oblivion
3.) Resistance: Fall of Man (MY FIRST FPS!)
4.) Bioshock
5.) Metal Gear Solid 3: Snake Eater
6.) Final Fantasy X
7.) Grand Theft Auto IV
8.) Kingdom Hearts I + II
9.) SOCOM: US Navy SEALs Confrontation (well, the beta at least :P)
10.) Star Wars Battlefront (First 3rd person shooter)