Honestly speaking I’m not sure If I’m an Im@s fan or Just a Puchim@s fan.
Puchimas is a spin-off short anime (around less than 5 minutes) from a very big game franchise named The Idolm@ster and Puchimas is the wackiest, dumbest and the cheesiest spin-off of a big and already a great franchise (alongside with Love Live, Kantai Collection, Touhou, etc.).
Puchimas is rather intriguing if Science Fiction is applied, but in this show slice-of-life is applied. Thus the questions of why they came is still a biggest mystery.
Puchimas is rather slow and very narrative on the first season where an entire story was done in as short as 2 episodes, or as long as 5 episodes. Season 2 was more random but they cover many stories. If an episode was not enough, they’ve got a double feature day. They also have a week long episode… so yeah it was also like season 1 but with boatloads of fun.
Another thing, there are also episodes that there are almost no dialogues or there are times that they have no dialogue at all (except the narrator).
So should you watch it? It’s definitely a yes… asides you can finish a season at 2 hours and 26 minutes(64 episodes), And the 2nd season is at 3 hours (74 episodes). Watch for it is very ridiculous and very cheesy.