I'm to lazy to write four reviews so I'm giving this five stars even though not all series deserve it IMO...
I love the first generation (the second series is by far the best of all four). There isn't one character that I don't care about, even if Chris, Cassie and Sid are my favourites I still find the others intresting and they all have a place. I also like the group feeling of them all.
The second generation on the other hand have some problems. The writing isn't bad, but not as good and there are some characters I can live without. Take Cook for example. I've seen Jack O'Connell act before and he's great (probably the best actor in the second generation) BUT Cook is annoying. Unlike Chris who was a bit crazy and party mad too, Cook isn't funny or likable in any way. Which is sad beacuse I like Jack. I find Pandora and Naomi to be the most intresting and in all, the girls are a lot better than the boys in this generation. The group feeling is completly gone... It doesn't feel like anyone really cares for their so called friends.
So I give this five for the first two series, though the third and fourth problaby deserve a three and a half and thats mostly for the girls.