FPS coop games

Campaign? I knew a few, but not many "campaign". Off the top of my head:

• Left 4 Dead 2
• Killing Floor / Killing Floor 2
• Payday: The Heist
• Payday 2

Pretty much all the main Serious Sam games.

• Borderlands 1 & 2 & PreSequel
• Far Cry 3 (Special Coop Campaign)
• Dead Island (& Riptide)
• Dying Light
• E.Y.E.
• Call of Juarez: The Cartel (Beware: Thrashy)
• Call of Duty: Black Ops III

If it can be third and not first person:

• Resident Evil 5 & 6
• Sniper Elite 2 & 3
• Saint's Row 3 & 4
• Star Trek

I've heard it's short, but the coop in Portal 2 is supposed to be really fun. :)

Serious Sam 3: BFE

Borderlands 1-2-The Pre-Sequel
Far Cry 4
F.E.A.R. 3
Painkiller Hell & Damnation
Serious Sam 3
The Darkness II

OP: Avoid PAYDAY 2 and possibly all Overkill games. The community hates them because of a million broken promises and the monthly DLC. Of my old friends who have played hundreds of hours of PD2 (myself included) probably 80% don't play at all any more, and that isn't just normal attrition because of boredom or other games that are more exciting. A lot of it has to do with active anger toward the devs and the development of the game. PAYDAY: The Heist is inferior, but the cost is low and fixed, which is kind of important when comparing it to the sequel.

Killing Floor 2 is pretty good. Killing Floor is fine, but inferior to the sequel.

Left 4 Dead 2 is pretty cool if it's new to you. Left 4 Dead is inferior to the sequel as well (except that you have feet!) If you and/or your friends have no experience with this series, definitely pick up L4D2.

F.E.A.R. was fun, but I didn't play co-op.

Borderlands series can be fun but I get kind of bored of it quickly. But people love playing it co-op.

Of third-person games, Saints Row 3 and IV are pretty damn fun co-op games. Don't bother to get Gat Out of Hell.

Very unrelated to FPS, but if you can do local co-op, install MAME, get your hands on a ROM for Bubble Bobble, and play with a friend. Best. Game. Ever.

Sven Co-op !

Borderlands 1-2-Pre-Sequel is good and funny in co-op
Portal 2 (isn't FPS at all, but you'll have a lot of fun)
F3AR (game isn't good as the first one, but in co-op could be funny)
Resident Evil [don't know what titles has co-op mode] - (I played few RE with a friend and I really enjoyed experience)
Left 4 Dead (you probably will like this one - eveyone likes hahahah)
Don't forget to check Sniper Elite V2 and 3 (as a fan of sniper weapons, I really recommend these ones)

There a lot of more, but can't reminder right now.

Thanks guys, had no idea some of these games had coop.

I really enjoyed playing FEAR 3 with my brother but it wasn't as fun as if I played it for the first time since I had beaten it previously.

I can't think of any unmentioned FPS coop campaign games, but I can find a few, not necessarily FPS, but over-the-shoulder games that can be pretty fun in co-op campaign.

Saints Row The Third, Saints Row 4, and Saints Row: Gat out of Hell
Orcs Must Die! 2
Dungeon Defenders
Dead Island

Halo 2 has an awesome co-op campaign but yeah iit's old Timesplitters also had good co-op but again its old sorry Arf.!.

Serious Sam. Not just SS3 had co-op but all except SS2. The HD remake of the First and Second Encounters are very old-school and really action-heavy.

Dying Light is a fun open world zombie game with parkour and crafting. The story and side quests can be done co-op. Synergy is a Half-Life 2 mod that allows story co-op similar to Sven for Half-Life 1.

Borderlands 2 and Portal 2 are both amazing in co-op.