1. Battlefield (2-4) even though 4 is a mess right now!

2. Day Z

3. Rust

4.Grand Theft Auto Online (5)

5.Sniper Elite V2

6. Max Payne 3 (when it first came out it was loads of fun, not many people play on the free aim servers anymore)

7.Mass Effect 3

8.Uncharted 3

9. Rainbow Six Vegas 2 ( still one of my favorite online shooters to this day)

10.Call Of Duty's (any of them, while not my favorite to play frequently, i do play from time to time. BF is just so much better!)

1. S.T.A.L.K.E.R. series

2. Silent Hill series

3. Deus Ex Series

4. Metal Gear Solid series

5. Mass Effect series

6. Red Faction Series

7. Resident Evil series

8. Hitman series

also non- series( or i only own one, or have played one) that i cant get enough of:

Borderlands

Just Cause 2

Madworld

Company of Heroes

Zombie Shooter 2

MineCraft

Heavy Rain

im sure theres more these are just what i can think of now8)