Boyle and Garland have, in their dotage, outdone themselves. The first film was good, the second almost entirely forgettable, but this third act, wow, fucking fantastic. “28 Swinging Cocks”, “28 Inch Cock” or “28 Dicks Later”, any could have been apt titles, but that’s too easy. This is the movie in which the anatomy is riotous, the intellect unashamed, the heart unexpectedly exposed.
28 Weeks Later was a solid zombie movie, but in and of itself it was not a genre defining (or redefining) film. Also, I think zombie movie fatigue was already in play by the time it came out.
Looking back, you might think that there were only a handful of decent and recent-ish zombie movies at that time (and you’d be mostly correct), however, it was also an era where the new releases wall at the local video store would have been peppered with d-grade, knock-off, cgi zombie movies (a few of which even showed up in the theaters).
So, while I don’t entirely agree that it was mostly forgettable, I certainly understand and think that’s a valid opinion.