It's relative, but...
It's (currently) the only weekly show I do not miss.
The first season was very good. (The DVDs are available at Walmart for around $20).
From what I've read, the budget for season 2 was cut. I considered season 2 to be a bit of a snoozer. (But still better than 90% of what's on TV.)
Season 3 (current) is very, very good. Of course, there are only 3 episodes left.
BTW The show has a continuous storyline. I.E. It isn't a bunch of stand-alone episodes, with a different adventure each week. Each episode is a chapter in the story. If you haven't followed it from the beginning, you may be left scratching your head.
Season 4 has already been approved too......