The only issue I have with this show is that the seasons are too short! It is a great show and all the actors are simply fantastic.
The other thing that bothers me a bit is that the writers jump too quick from one story line to another. For example, when Grace and Frankie get their house back, they should have been shown more how they both settled back in. But the way this shows moves people emotionally is worth everything and the wait for the season six!!