I watched the first 2 seasons a while back, latest season is already on one of the BBCs, if its back on Netflix than I know what I'll be watching tonight lol.
Didn't fuck with the protagonist at all in the beginning - even thought it was a British Viking's rip off at first - but loads of interesting side characters and the protagonist ain't that big of an idiot after all lol.
And there is progress in the storyline, no dragging love interest or other filler type episodes.