Alright I love this series, taking out the third generation, this show is real, that's the best and the worst part of it.
May seem over exaggerated but I believe it shows an aspect of life that we like to pretend doesn't exist. All the fuckups, and the unfair, they all are, we're all somewhat fuckups, life never turns out perfectly fine at the end; and I think the last season was brutally real, wasn't indulgent, stayed in character everything that happened in the other seasons, and didn't lie; life is wonderful, but sad most of the time, things don't turn out okay after a shitty time.
Skins shows people that aren't often portrayed on tv, people that we need to talk about, with problems society doesn't try to solve as hard as it should, rather society makes them worst in most cases; and the shows talks about them in the most real way, with all the bad that it is, but trying to deal with it with humor, as real life.
Obviously don't take it as a bible, life isn't exactly this, and doesn't have to be, it's just another part of the story and for what it is, it's beautifully done.