Starting off there are the really good episodes like "Seasons of Belief", "Cutty Black Sow", "Don't Open this Box", etc. And then you have the really poor ones like "...Comes out in a wash", "if the Shoes Fit".
So it's really a mix of the very good and the very bad. So in a way I'm conflicted on how to rate this series. If they had grouped all the better episodes and separated them from the bad then without a doubt this series would totally be up there in the same leagues as the Twilight Zone. But the really good episodes are the real reason that keeps this show from being totally forgettable.
Though I must say there were a few episodes that I felt were not that bad and are under appreciated like "Distant Signals" and "Red Leader", but that's just me.