After only a few weeks, the soldiers were so blinded by lust that they were going to rape a child. That's where this movie lost me.
Actually, for all they dress Hannah up too, none of the soldiers actually seem interested in her. Not that that makes them any less terrible, but that observation can make the whole thing (slightly) less uncomfortable to watch.
They aren't blinded by lust. They've lost hope of survival because they have no future to look forward to. Women represent that hope that things could get better for them, and they aren't going to let things like consent or age get in the way of that hope.
That's still an extremely short time for soldiers to be so overcome with despair that they'll resort to rape. It's not uncommon for soldiers to be separated from their wives/loved ones for a year or more in Real Life, and most of them can avoid cheating on their spouse, much less rape. There are obviously exceptions, but it is grounds for trial by court-martial, dishonorable discharge, and imprisonment. For an officer to condone it a mere month after the plague first hits is a bit much.
Of course, those situations are a little different from the end of the world.
In less than four weeks after first infection Britain's population went almost extinct. There is no "too fast" here. Those men are one hundred percent sure they are last human beings in big radius, surrounded by hundreds of dangerous carriers of easy-transmitting disease and it's really no wonder they are convinced they are alone. Think about it. They are not some random Rag Tag Bunch Of Misfits. They are soldiers on duty. They didn't picked up any radio broadcasts for past two weeks. No fellow soldiers out there. No HQ. No civilian activity. No nothing. If military got over-run, then who could survive the carnage they seen by their own eyes? And they are in their home ground, so that means they can't just pack and go back home.
Exactly. The soldiers aren't overseas fighting another country until the wars over and they can come home; they're in the middle of an apocalyptic pandemic, they've probably seen their buddies killed or infected along with their family and any girlfriends or wives they might of had and in their mind the world as they've known it is over. And the officer probably believes the same thing. His family and friends are dead and the only people he's got left are his soldiers. We heard that he had found one of his soldiers with a gun in his mouth because the world was "futureless" so in a desparate attempt to keep his men together and keep morale up, he "promised them women." He was probably already cynical (his people killing people speech at dinner) before the infection, so seeing people he knew or loved turned into diseased beasts probably traumatised him to point of insanity. Plus, except for the Only Sane Man, most of the soldiers were young kids who probably had their whole lives ahead of them before, and are now (in their mind) "futureless". Certain people do crazy things after passing their Despair Event Horizon.
Not to mention that military officers being complicit in rape isn't unheard of in this reality.
Have the soldiers not considered simply vacating to another country? Though there were (spurious) rumours about the plague being in Paris and New York, it seems improbable that they wouldn't at least try to get off the Island, rather than resorting to raping the few survivors.
They don't know that they've been quarantined, in their mind the world has ended, they're still alive, and England is their home. Why leave one location thats familiar for an unknown location if you expect the same chaos there too?
Not to mention they've created themselves more or less safe haven in the mansion. They got shelter, easy to defend area, supplies...
Where are all the cars in this film? The motorways are completely deserted, when surely they would be chocked full of cars from when people were trying to evacuate the cities.
There were deleted scenes with piled up cars blocking motorways, but the CGI looked fake so the scene was cut.
And why exactly the roads should be blocked in the first place?
Considering the infected don't eat -likely- don't sleep, don't hydrate, don't exercise proper hygiene, are constantly vomiting large quantities of their own blood, and run full speed -with full exertion as a result- after any potential target they see, shouldn't they all fall over dead within three to five days after initially being infected?
Presumably, some do. We see quite a few human corpses littered throughout Britain during the travel montage, namely during Jim, Selena, Hannah, and Frank's exit from London. It could be that the virus allows some Infected to last longer than others because of the effect it has upon their minds. It takes a human body quite a while, after all, to die from lack of hydration and malnutrition. In the case of hydration, the reason why humans generally die within a few days is because their body goes into shock from dehydration, which the virus could, presumably, keep from happening. In which case, it would probably take a week or two for an Infected human to fully give out from dehydration.
It's partly hand-waved In-Universe - West restrained Mailer just to check out how long it will take him to die out of all the factors listed above. We simply never got the chance to check out the results, because all scenes in the mansion happens in about 30 hours. So Mailer got infected three days before the climax, where we last saw him.
Realistically, there's no way Jim could get that much blood on him and not have a drop of it get into his eyes or mouth. Even if he did somehow avoid ingestion or eye contact, there's no way he could keep from inhaling a few droplets—presumably, if the Rage virus can spread through oral membranes, it can spread through nasal membranes too.
Which scene? The one where the infected burst into the house after he lights the candle, or the part at the end?
In case of the "candle attack", he wasn't sprayed with the blood that much. Actually all he got was bloodied hands and sprayed clothes and all the blood came after the infected got killed, so no High-Pressure Blood. In case of the climax, all the blood Jim is covered came from healthy soldiers whom he killed.
So I am genuinely curious about this, but why didn't Frank bring his riot gear with him? That seems like an incredibly useful piece of equipment against the infected, why not bring it?
Most likely Idiot Ball, but a justifiable In-universe explanation could be that his gear, despite the protection, probably wouldn't be of much use in an open area. Keep in mind he wore that stuff and was guarding a small entryway, so it would be easy to block off the zombies. In an open field, all it would take is one zombie, or more likely ten, attacking him from behind while he's busy fighting/blocking another from the front. He also didn't wear it 24/7 since it would probably be uncomfortable for extended periods, and it didn't seem like their car had much more room for anything else, so instead of that extra weight, they would have likely of chosen to carry more food/water.