Episodes 1-5 (ish) just fall flat on their face, it's so hard to have any real interest in the characters as they're built up so poorly and quite honestly, are just plain annoying almost all of the time. Plus it seems they ran out of budget when it came to lighting, as it's almost exclusively filmed in the dark, which doesn't help.

From episode 6 onwards the series completely changes. They really find their direction, stop wildly throwing the story about and build genuinely likeable characters.

Then season 2 is excellent throughout.

It really is worth grinding through the first few episodes.