Yeah that episode was like, JUST okay for a venture bros episode but not great for a season finale. Compare it to literally every other season finale.
1: JJ emerges from Rusty [god every time I type anyhting about this it feels gross] and the boys are killed, thus leading into the revelation that they are clones in season 2.
2: Monarch and Dr Girlfriend finally get married in a 2 parter where theres a fuckall massive battle, which leads into season 3 where the monarch and dr girlfriend become co-operative villains and Phantom Limb becomes a primary antagonist to the show.
3: ends with another massive two parter where Brock is seemingly hunted by the OSI, ending with a large scale battle that kills all the remaining hank and dean clones AND even 24 who was a significant character. This leads into Brock quitting the OSI and joining SPHINX, Sgt Hatred joining the Ventures and 21s growth.
4: Ends with Operation Prom, which concludes with SPHINX rejoining the OSI with Hunter at the helm, sending Traester into space, Gary  QUITTING being a henchman and ends with Dean finally standing up for himself when the world is telling him to just be happy for someone else [saying Fuck You to the Outrider]. This leads into season 5 where Dean tries to become his own person and Gary tries to find himself [though ends up back with the Monarch.]
5: its weird because I consider All That And Gargantua 2 to be the season 5 finale but its usually listed as a season 6 special so i'll combine The Devils Grip and All That because fuck it. Devils Grip kinda just ends with a minor character dying and Dean finally telling Hank theyre clones but thats kinda just it and i guess also with Monarch and crew moving to Jersey. All That ends with the conclusion to The Revenge Societys whole deal and kills of two major characters and leads into Ventures moving to manhattan which is where the show takes place currently.
[post too long gimme a sec]