Brilliant series, just finished series 5 myself.
Great characters in it, good storylines, really well acted.
first time or second, watching it?
It is my first time this far into it, so a lot now happens that i was not mentally or emotionally prepared for. You think, it is pre breaking bad, so it won't be as hard hitting.
But in reality, it pushed boundaries back then, and took themes to a level that has inho influenced many of the much later big hit series.