I said we are "ostensibly halfway" through season one, which we are since this season is listed as only having 12 episodes. ( http://en.wikipedia.org/wiki/Defiance_(TV_series) ) And the first two episodes were the series premiere. We are, for all intents and purposes, halfway to the end of the first season. If you want to quibble about being on the lee side of the 6th episode so be it. It's too trivial to waste time arguing over.
Also, we need to remember that when making comparisons, SGU had 20 episodes per season whereas DEFIANCE only has 12/13 episodes per season. Granted, we can still chart the downward spiral but we need to keep in mind that SGU had more chances to repair the damage than DEFIANCE has.
And yes, it was "renewed" which is a fraudulent way of stating that the show had a guarantee two season run from the get go. This is so patently obvious that to state otherwise is to be delusional. Nothing was legitimately renewed here, rather, the marketing department is simply doing their job.
No Syfy show is gonna get "renewed" after only 4 episodes on a down ratings trajectory.