The Left for Dead series most certainly. I love the co op feature the most. I overly enjoyed playing with my friends and family. I wish we could get a 3rd installment (yes I know the Valve joke). This is why party chat was so great! Games like this. Surprised it never hit PS systems tho.
PSN ID- Rafie27
XBL Gamertag- RAFIE82
NNID- RAFIE82/ Friend Code: SW-6006-2580-8237
YouTube- Rafie Crocheron