Sentence:  It's fascinating to see a show wrap up in a manner wherein many of the flaws so clearly occur offscreen rather than on; the plague of season eight hasn't been <WSD>lackluster</WSD> episodes, for the most part (though “The Last Of The Starks” was a definite low point). 
Meaning of the word marked with <WSD> tags:  Not exceptional; not worthy of special merit, attention, or interest; having no vitality.