Co-op can enduce even more trolling than competitive, I think. People trying to score more than their team-mates can cause people to do stupid things. Hopefully there's no self-scoring in co-op. It's never made sense to me to have individual scores in a co-operative environment.
Very true, I encountered some real pathetic scum in Uncharted, too eager to have the highest kill count - one guy hunted me down the entire match once - another rage quit the moment I snatched the Hammer on Museum.
It's a shame indeed, but I think people may have a different attitude in The Last of Us given there are rash consequences for just being stupid. - I'm not entirely sure about removing individual scores entirely, I'd still like to be recognised for say getting the most revives or most time spent un-detected. Maybe medals or badges? At least then there'd be something to make you stand out for your abilities