The third and probably final series of the Inbetweeners brings much of the same cringeworthy, peurile humour as the two that preceded it, but lacks the charm that made series 1, in particular, such an instant comedy classic. This is probably not a failing of writers and cast so much as a reflection of the fact that the central theme (the trivial traumas of four irretrievably uncool sixth form blokes) is fairly one dimensional, so grinding out another six episodes inevitably meant things would start to get tired.
This isn't to say series 3 isn't worth watching. If you enjoyed the earlier escapades you'll likely get a reasonable enough couple of hours of entertainment out of this. Just don't buy it expecting either the laughs-per-episode quotient or the rewatchability of its predecessors.
Right, I'm off to check out the clunge mags.