I watch this show most of the time. It's erratic, but I like it a lot anyway.
The producers seem to have relatively little idea of what kind of show they want to do. It's now in its third season, and it appears to have gone to heroic fantasy. (Any episodes you see Dar having a sword, they're all third season. And he puts up quite a protest around it, but you'd have to actually watch the show to see it.) Last season would be better characterized as a sort of low-level high fantasy, where most of the emphasis was on complex relationships between all the different characters. And a lot of the first season was a (tragic) love story.
The acting is great, but it's very much in a particular style. It's an understated style that shows up a lot in Canadian productions (it's a Canada-Australia joint production).
But the best part is: They kill characters. Major characters. Not many of them, but people actually die. The storyline moves on. I get really tired of watching adventure shows with no threat of death. It's pretty much a given that Dar won't die (or they'd have to rename the show) but everybody else, except for gods (none of which have made appearances, unlike in a show like Xena) and some of the demigod-level characters (I'm thinking of The Ancient One) has been fair game. It helps make the show exciting, which is the whole point of adventure, right?
The acting style's not for everyone, but if you like it, watch the show. The stories are generally pretty well-written, and the show's got guts.
