I'm all for people trying something different with the zombie/infected movie, UNLESS it's at the expense of all that is enjoyable about the genre. The Vanguard attempts a vaguely art-house approach, with a contemplative mood, introspective narrative, a degree of quirkiness, and an attempt at social commentary about racism, but offers none of the stuff that usually makes these kind of films fun: gore, excitement, scares, and more gore.
The Vanguard does have a couple of good basic ideas: they're the same ones used for I Am Legend and 28 Days Later, only here they are completely wasted by film-makers with no idea how to turn them into an entertaining movie. The acting is mediocre, the action is dull, the splatter is restricted to some arterial spray (some of it crap CGI), the characters are irritating, and the 'zombies' are very disappointing, loping along like apes, growling like lions, and sporting naff zebra stripes drawn on with face-paint (I realise they're supposed to be like animals, but this is too silly for words).
Somehow, this film garnered some decent comments from Fangoria and Gorezone (who are proudly quoted on the DVD cover), and was selected for the Dead by Dawn horror festival; I'm not quite sure how that happened, but take it from me (and the majority here on IMDb who have voiced their opinion)—The Vanguard sucks, even rivalling The Zombie Diaries for the title of worst British zombie film.