I really like "Skins". I liked the first two series quite a bit and the third was... well, still pretty good! But the show seems to have really hit a major speedbump in the fourth series. It had two big problems and those were named Freddy and Effy.
Most of series four seemed to center around these two to an unholy degree, and occasionally touched on Cook's relationship with Effy as well. Effy and Freddy (Freffy to some who need to get smacked), dominate a lot of screentime, which would be fine, except that neither them nor their relationship is nearly as interesting as the writers seem to think. What happens to Freddy at the end of the series was especially annoying, as was the fact that the final episode seemed to be two that were mashed together into one.
However aside from all that, and that's a pretty big "aside", mind you, the series was decent. JJ, Cook, Emily, Naomi, Panda, Thomas and Katie all had pretty decent story arcs, and the acting from almost everyone was good. The trademark humor was there still, at least when it wasn't buried under piles of teen angst.
While not as good as series one, two and three, it's still worth watching, and you'll probably have to see it on DVD since it seems unlikely BBC America will still broadcast it.