At what point is your game irrecoverable?

When your team is losing all fights, and cant split/seige.

When the kill difference is differend by ~50%(imo)

When your teammates are idiots and afk farm.

I usually put it around the third lost teamfight. That's when things get really difficult to come back from. Odds are those three lost teamfights mean at least three lost objectives.

When the Master Yi gets 3 quadras because my team refuses to use their brain.

We still won, so this isn't a valid response. I just wanted to tell you can overcome a disgusting fed Yi if you set your hacks mind to it.

Generally when the enemy team aces you 30 minutes in, while your down 2 inhibitors, while they are close to your base.

At what point is your game irrecoverable?

I don't know any more.

Actually won a game where my team got qudraed then aced by the enemy Ezreal (sucker wasn't fast enough to get the penta), and penta-killed by the enemy Yasou. Enemy team also got Baron 5 times to my teams 0.

Still won. Had to turtle pretty much the entire game, and win 3 otherwise decisive team-fights against the enemy rather than 1. But end-game my team just voted on who we were going to focus down in what order, and we focused them down in that order.

It's not over until the Nexus explodes. Also, the epic feeling of winning what otherwise seemed like an un-winnable game feels pretty chosen-one and heroic.

If you're asking on when to surrender - that's really up to you, though I'd mostly look at inner-team dynamics. If you're team blocks for the man on the left like a Spartan you can win pretty much any game.

If your team has afks/dcs or is uncooperative and fighting with each other, you might as well fold your cards because the game is most likely irrecoverable.

When people are insulting their team in all chat.