This is a review for "Dead Set" the episodes, NOT the DVD (and associated extra features) as it has not been released at the time of writing.
Dead Set is a very respectable zombie horror. It is a classic tale of a small group of isolated survivors in the face of a zombie apocalypse. Whilst this is horror/drama it does not suffer from the common affliction of taking itself too seriously. There's plenty of black humour and lighter moments as a counterpoint to the scares and gore.
The scenario borrows from Dawn of the Dead, with the survivors holed up in a secure compound (once they've dealt with the immediate threats). The twist is that the compound is the Big Brother house and the contestants are initially unaware that anything is wrong with the world outside. By the time they find out it is too late to do anything but sit tight!
Another thing this has in common with the DotD remake is that the zombies in this are "new skool" running zombies (of the type first seen in 28 Days Later). This may upset some purists who insist that all zombies should be shamblers but fits perfectly with a modern day, fast paced scenario. The speed with which the infection spreads is frightening and the undead are like a pack of ravenous animals. With shuffling zombies it's usually sheer weight of numbers that overwhelm the heroes but with the visceral, panting, lightning fast beasts they are unnerving and dangerous individually and terrifyingly deadly in a group.
Like all good zombie horrors, once the immediate danger of the undead is kept at bay, the danger then comes from internal conflict. With most of the survivors having already spent the best part of 2 months in each others' company tempers fray pretty quickly, leading to fatal consequences. Because this is the BB house the characters are mostly obnoxious, obscenely thick, gratingly annoying, utterly weird or infuriatingly arrogant (or a combination of several of those!). There is the risk that with such potentially dislikeable people as our survivors that we don't positively look forward to seeing them torn apart! However, the groups' humanity is kept intact by a few "normal" people and enough redeeming characteristics in the group as a whole to make us care about them.
The acting is mostly convincing (although a couple of characters are deliberately OTT) and whilst there are a few moments that are unintentionally funny, most of it is believable (well... as much as a zombie apocalypse is believable anyway!).
All in, this is a reputable stab at the horror genre by Charlie Brooker. There are some genuinely scary moments, a lot of tension and welcome comic relief. The prosthetics and make-up are all very convincing and gives the impression of it being much higher budget than it really is. I was going to give this 4 stars but genuinely couldn't find a reason not to give it that extra one. If you like zombies or horror then you shouldn't be disappointed.