The tone/style of the show changes with each season, and not just in the obvious sense of it getting darker. You can sort of tell the storyline was constantly under reconstruction and collaboration, as it sometimes felt disjointed and vaguely odd. Not knocking it, but there isn't really a single series which is indicative of the show as a whole, in my view. Then again, if you aren't hooked by the premise and it hasn't stood out to you, then maybe it is best to just stop watching it and contact a GP immediately.