Of the roughly 26 episodes to date, I would say perhaps 6 or 7 have been outstanding. Sadly, much like one of the more recent Stargate Atlantis episodes, this was too close to a turning point in the series. As a result you don't necessarily see the benefit from such a great episode.
A quick rehash of the next few episodes tells me you have a bumpy ride ahead. However, I'll echo what rfduncan said - it gets much better towards the end of the season. Looking back you'll appreciate the subtle hints dropped over the course of the season that build up.
It's only 13 episodes, so you're already about 1/6 of the way through. I'd say you don't have much to lose by watching some more. If by 3-4 more episodes you're not satisfied beyond what you are now I'd drop it.