These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Base: Go up to a group of fans of this movie and ask one simple question - 'is 28 Days Later a zombie movie?' Then stand back and watch the ensuing punch-up.
Ending Fatigue: For "surviving the apocalypse" movie fans, this movie starts off great but then makes a hard left midway through, sticking the main characters with the soldiers who take the forefront as antagonists and carries a different tone to match.
What an Idiot: The activists who free the monkeys in the lab at the beginning. The scientist even tries to warn them that they shouldn't do that, but of course they do it anyway. Especially the girl who releases the monkey, who is "thanked" by being bitten and becoming the first human victim of the rage virus.