Back 4 Blood was the game that served as the idea for this post.

I recently felt like picking up some cheap copies of it to play with a few friends, and decided to launch it once ahead of time just to test it out and see how it ran. I picked "Online" mode out of habit, feeling it would likely search for a bit before handing me 3 bots to play singleplayer. Instead, I actually got a decent group of people together several days in a row.

In B4B's case, while the developers visibly "abandoned" the game in news headlines, the form it exists in is very playable and generally bug-free, even if its ultra-highest-difficulty "endgame" allegedly lacks some refinement. It got a lot of outlash for not matching the playstyle of Left 4 Dead; having players use a deep system of roguelike-style upgrades. Since the enemies escalate in difficulty, those upgrades are often necessary and can connect with team strategy. It's now on PS+, and since it's crossplay, Steam players will get a lot of queue buddies. It's also playable with just 2 people since the other 2 characters will just be bots.