Season 1-2 were refreshing and unique with the 80's atmosphere, horror elements, and charismatic characters.

Season 3-4 are almost entirely the same recipe except now it's getting boring having been there done that. The latest season's episodes are very long (1h 15min) and couldn't keep my attention for more than 20-30min each. The Russian storyline was completely detached from the overall plot. The CGI was not the best & the humor this time around felt very forced (especially from Robin). The charm has simply worn off.