4.5 Remains Watchable But Not Castle's Strongest Season deanlowdon | 01/04/2013 | See all deanlowdon's reviews (468) Castle's fourth season saw the show trying to mix things up a little more with varying degrees of success. It is still very rare that an episode fails to make for an entertaining watch but I personally have two minor grips that arguably make for the shows least consistent season thus far. Firstly the central mysteries themselves aren't quite as clever as they were previously with revelations/twists seemingly coming from out of the blue on too many occasions.Secondly, and perhaps more importantly, the chemistry and banter between Beckett and Castle that is so central to the shows appeal is just not as sharp as it was throughout the first three seasons. This is in large part due to the fact that the writers seemed to be struggling to think of believable reasons to keep them apart throughout the twenty-three episodes found on this DVD, apparently for fear of changing the show's dynamic to drastically. All shows must evolve if they are to avoid becoming stale however and with a fifth season now confirmed to develop upon the events of this year's finale I will be tuning in with the hope that Castle can return to top form once again.