As someone who spends around 12 hours each weak playing couch coop games, and has been doing that for around 6 years now, I would like to note that this perspective is somewhat outdated.
Here is a list of couch coop games we completed, on PC, in that time period:
Code:
27. 08. 2010 - Lord of the Rings The Return of the King
02. 10. 2010 - Lara Croft and the Guardian of Light
11. 07. 2011 - The First Templar
20. 08. 2011 - Dungeon Siege 3
10. 12. 2011 - Renegade Ops
27. 01. 2012 - Jamestown
21. 07. 2012 - Trine
03. 08. 2012 - Dungeon Siege 3 - Treasures of the Sun
04. 08. 2012 - Bennu
10. 08. 2012 - Renegade Ops - Coldstrike
15. 09. 2012 - A Virus named Tom
14. 12. 2012 - Pid
04. 01. 2013 - Critter Crunch
29. 03. 2013 - Capsized
19. 07. 2013 - Bleed
06. 09. 2013 - N 2.0
20. 09. 2013 - Monaco
27. 09. 2013 - Sacred Citadel
08. 12. 2013 - Rayman Legends
13. 12. 2013 - Hammerwatch
27. 12. 2013 - FORCED
24. 01. 2014 - Pixeljunk Monsters Ultimate
28. 03. 2014 - Spelunky
06. 06. 2014 - Child of Light
18. 07. 2014 - Crimzon Clover WORLD IGNITION
18. 07. 2014 - Octodad: Dadliest Catch
08. 11. 2014 - Defense Grid 2
14. 11. 2014 - Binding of Isaac - Rebirth
21. 11. 2014 - Never Alone (Kisima Ingitchuna)
13. 12. 2014 - Aqua Kitty - Milk Mine Defender
27. 02. 2015 - Woodle Tree Adventures
17. 04. 2015 - Dynasty Warriors 8 XL
22. 05. 2015 - ibb & obb
29. 05. 2015 - Phantom Breaker: Battle Grounds
13. 06. 2015 - Crypt of the Necrodancer
03. 07. 2015 - Lara Croft and the Temple of Osiris
07. 08. 2015 - Cook, Serve, Delicious!
25. 09. 2015 - Chariot
09. 10. 2015 - Assault Android Cactus
01. 01. 2016 - Tales of Zestiria
23. 01. 2016 - Tales of Zestiria - Alisha's Story
06. 02. 2016 - The Witness
18. 03. 2016 - Nomnom Galaxy
01. 04. 2016 - Towerfall Ascension
22. 04. 2016 - Wyv and Keep
30. 04. 2016 - Broforce
30. 04. 2016 - Ancient Defense
02. 07. 2016 - Salt and Sanctuary
08. 07. 2016 - Pix the Cat
22. 07. 2016 - Straima
09. 12. 2016 - VR The Diner Duo
07. 01. 2016 - Woodle Tree 2: Worlds
Note that this is just the subset of completed games. There are some, particularly STGs, that we played a lot but didn't complete. As well as couch coop games without an explicit "clear" condition, such as Audiosurf. And games we are still in the process of playing, like Trine 2 and N++.
It's still not enough for us to make do with just PC for local coop (Nintendo has some amazing exclusives), but it's getting there