I think part of it is that this particular plot point—much like the Iris situation—was drawn out too long before being addressed in a somewhat definitive manner. But some of that may have been due to the expanded series order reshuffling the deck. I would personally disagree with the protagonists being bone-stupid, but I think that's one of those "agree to disagree" things.
(On the whole, I think the Flash as a show has had excellent pacing, with a few notable exceptions. A lot has happened in these 22 episodes, especially compared to other shows that advance at a glacial pace.)