This half-season of P&R does have the feeling of being a little more than was needed to close out this show; in particular the start of the season and its continuation of the jump forward in time felt a little clunky in the way it works its narrative. This does not last long though and the season sets up a reasonably solid narrative which provides a frame for the final episodes. It does occasionally feel overly sentimental and tidy in how it does this, but mostly it is funny and allows the characters to play out their threads in ways that are in keeping with the seasons before, and brings it to a close fairly well.
It doesn't totally avoid the sense of it congratulating itself though, and some of the material leans towards sentiment. The Johnny Karate episode in particular didn't really work for me, and sometimes the plotting goes too far in the search of a happy ending for all, but mostly it works pretty well. The cast seem to enjoy themselves but don't lose sight of their characters; only Pratt stands out by virtue of how toned he is throughout. Okay it has the slightly bloated and celebratory feeling of a reunion tour, but it is still pretty funny as it does it and it serves as a surprisingly neat and enjoyable conclusion to the show.