I think that adding an infinite respawn might be a good or a bad idea, it depends on the balance of the two sides. if fights are equal, it will be a good move, however if you turn out with one side having 5 players each with 20 kills, and the other side with 1-2 kills each, it will be very detramental for the game.
If infinite respawn is added, then they should also add a rating system, or rank system.
the times you have to see it. even if the opposing team has 20 kills more, you can still win through tactical play. The mistake is to play only in the domination almost all try TDM. We have often won games even though we had a lot less kills