You really need to log when the player gets kills or gets killed by the enemy and by who/what. It would be necessary for reports on intentional feeding.
First example, I tend to intentionally kill myself off towers to deny enemies the kill. If I towerdive somebody, grab the kill, but have 4 people now chasing me, I'm running straight for the next turret. Just because I might have a lot of deaths in one game, which are intentional, doesn't necessarily mean I'm intentionally feeding. I don't think I've ever been reported for this, but I do it at least 3 times a game, I would say.
Second example, what if a player is actually doing fine early in the game, but has teammates which go 0/5, hence giving him very tough enemies to fight against. The player is now at a huge disadvantage and is likely to get 5-man towerdived a few times because of his teammates. He'll probably get reported for intentional feeding when 1) it wasn't his fault nor was it intentional, and 2) his deaths are likely to be spread out over time indicating that he did his best to avoid being killed.
Third example: similar to above, a player is doing pretty well early. This time, his teammates are doing fine, too. Eventually, the player gets fed up with his teammates doing stupid things and gives up. He begins feeding without saying anything. Since he was doing well early, his K/D/A ratio still looks "normal" even though he has started intentionally feeding. The team surrenders and this guy deserves punishment, but due to his normal-looking K/D/A, that is unlikely.
Allowing people to review more detailed information on how the reported player has died would eliminate the above problems.
Also, why is this not mentioned in the news? It should be. That's the only way you're going to grab more attention from the users.