You will probably hate me for saying this but...
In my experience if you have died to a certain player repeatedly, it is likely he will kill you again unless you get lucky. He has probably better gear, a level advantage and sometimes more experience. This means he's faster, has more HP and damage and may have a crucial ability more (like an interrupt or stun).
Let's say we had that revenge system in place, what would happen?
- New players would try to get back at their nemesis instead of avoiding him and would feed him.
- Experienced nemesis players would taunt their victims into a trap (like running around with 50% HP and popping a potion and turning around to attack).
- Inexperienced players would neglect important tasks to get back at their nemesis, forfeiting XP and gold and probably die in the process.
Nothing feels better than to get back at the player who killed you 3 times already and it's sweeter than sugared pineapple, no argument there. But I strongly advice against making this one of your important objectives. If a player has killed you 3 times in a row, he usually knows what he is doing and you are probably not careful enough. (I have been there myself... 
) The last thing you want to do is engage him over and over again (unless you gank him). That's exactly what he's waiting for, you will play right into his hands.
IMO the revenge system would make an interesting game mode combined with Slaughter and would be great fun for experienced players. However, if you have one overzealous player on the team...
@ Creep666: You are a good player (great game btw, thank you!), and this system will add more depth to your games. But let's be honest, players who ragequit after one or two kills are not experienced or they would know that they can easily turn that game around. They are mostly likely not even willing to learn how to play properly. They are waiting for a game where they get lucky and can accumulate enough kills to stomp the other team. Revenge might keep them a few minutes longer in your game but in the end they will most likely feed and leave 5 minutes later.
I agree that it will make comebacks easier after a bad start but I'm not convinced that the advantages outwight the problems this system might cause with random teams.
