Someone gets a bugbite in their hand which makes it swell up, someone else gets shot through their hand with an arrow, there might be more but i forgor
Also while we don’t see them die, a dead roast pig with an apple in his mouth is shown several times during the evaluations around 45 minutes in, then about five minutes later we see some dead fish close up on a table. When Katniss is in the arena we see the skinned body of a squirrel of some sort.
One of the sadistic teens who bragged about killing Rue (the 12 year old), while she was attacking Katniss. The guy from the same district as Rue sees and hears this and pulls the girl off of Katniss, saving her, and then kills the girl. It was no worse than any of the other killings. Other than the fact that this guy didn't attack that girl and kill her for fun
There are some injuries shown. The closest to body horror would probably be a body swollen with insect bites. But there is no mutation or supernatural transformation
More romanticized than sexualized, at least in this movie. Minors are coerced into a romantic relationship including kissing on television to increase their odds of survival
her dad died years before the film in a coal mine explosion and her mother is depressed and stops taking care of the children, katniss has to take care of herself and her younger sister
No one is in a real committed relationship, so no one can actually cheat. However, there is a rather complicated situation where characters are forced to act out a relationship for the cameras, and it's not clear if both of them realize it's an act. It's definitely not cheating (neither character is in another relationship) but emotionally it is tough.
the girls are sometimes wearing short skirts, dresses, high heels, etc to look more attractive and likeable to the capitol but it isnt talked about or an important part of the movie
For the storyline (lots of people dying) it has a happy ending.
The games are concluded in a somewhat satisfying way (protagonists survive), their mentors are still mentoring, etc.
But, the world is still "broken" and the protagonists are aware of their vulnerability.
The series has a lot of hard aspects to it, and whether you think the whole thing is worth the ride or not is subjective. There is a satisfying end, though it isn't all happily ever after. And there is a lot of heartbreak along the way.