when someone intentionally feeds, you aren’t playing the same game anymore.
The ones that obsess the most about winning tend to be the ones that know the least how to do it; if someone isn’t prepared to ‘waste’ their time losing at a game, then they don’t enjoy the game. Winning or losing aren’t the objective, playing the game is. If someone is trolling the game, then you aren’y playing the same thing anymore so it does matter to the experience.
The OP isn’t saying “hey, I like to sit around and just have anything happen,” their concern is the integrity of the match, and good players don’t care as much about the outcome, they care about the part in the middle.
The first thing you can do is actually look at what assets your team has. When people point out more of what the enemy team has, they’re setting themselves up for failure because they refuse to acknowledge what they have on their side. We have little advise for you as winning 1 v 3 is incredibly difficult, and that’s the only thing you have conveyed.
A “Tank” is simple a player that draws attention, so if a team is going to focus on a hero, one way to deal with a lack of “tanks” is to be ready to assist that player instead of everyone running away without contributing due to the team not having a “tank”.
As volun pointed out, statistically, tank vs non-tank matchups aren’t as impactful as some players think. The ‘average’ player just wants anyone else to do what they won’t and they try to force all the focus onto a single player, and most tanks simply can’t actually withstand whole focus.
Healers are considered more impactful on mismatches since heals and mitigation can essentially make any player a “tank”. Typically double-healer or healer+support compositions do a better job of helping a non-tank hero function as a tank (protect hammer teams, tank xul, hypercarry, etc). So if the teams have a healer or support, that is one consideration at hand. If it’s an entire dps match, that’s a different.
So the biggest advise anyone can offer on any game, plan, or castle raid is list your assets, even it it’s just an albino with a wagon.