I was talking in another thread about ratings, and I realized there is a very good point of comparison: Battlestar Galactica.
BSG's fourth and final season pulled down a 1.8 rating. The early part of S4 pulled 1.1 ratings (ouch). For the show's entire run, its peak rating was something like a 2.6. Now, consider that BSG got a crazy amount of press and a ton of promotion.
Another point of comparison: Dollhouse, a show promoted respectably on Fox, never did better than a 2.0, and that was for the pilot. It got renewed.
Seeker's rating of 2.0 on the back of zero press and zero promotion while being aired inconsistently across numerous networks and time slots is downright impressive. Not being aired predictably has been the ruin of many great shows. Also, the Xena factor, because you have to assume some people stuck their noses up at Seeker because they think all fantasy shows are crap, has to factor in.
To be honest, I don't know why ABC Studios (who make Seeker) doesn't reel this thing in and air it as a regular program on ABC. On a regular network with a regular slot, Seeker could pull down a 3.5 to a 4.0 rating, using half the budget.