Can't think of too many times during the movie or reading the books where a situation was really painted where I was cheering on kids to kill other kids.
If anything the entire thing is portrayed as horrendously barbaric and indeed most of the kills are shown to be quite disturbing rather than moments of victory.
I haven't read the books but I can imagine they are more morally ambiguous than the film.
In the film there is a clear hero and villain. There have been reviews, including ones in the movies thread, that have said viewers hates Kato and wanted him dead. The film was pretty much structured for the viewer to cheer for Katniss. There were only a few times where the total barbaric situation was really fleshed out, once when Woody looked at the kids pretending they were fighting and when District 11 rioted (which left me wondering why they didn't all do that before).
The kills are shown to be disturbing but it's clear the viewer is meant to be more saddened by Katniss's situation and Rue's death than by any of the others. For example some of the kids were complete bloodthirsty killers. They were laughing and mocking their victims. I would have rathered a film where every child is hesitant to kill which is what I would imagine in that situation. But instead we have children who enjoy killing and that leaves viewers cheering against them.
I think it would have been a lot more disturbing for Katniss to have to kill children like Rue and Peter. A lot darker too. I don't know what it's like in the books though. It was clear you were meant to cheer for Katniss in the film and it would have been better with a more morally ambiguous story.
Plus I couldn't help but enjoy the parade style and the tv host. In a film like this I wanted to be disgusted by it all, which I think adults might have been but I doubt kids would have been. I just found it hard to believe so many of the children would be bloodthirsty psychopaths. It turned the games into a good vs evil tale when it should have been a complete morally dark story aimed at adults. The good vs evil part should be the districts taking down the heads of the lady gaga society which I imagine happens in the later books.