8.6/10. A really well-balanced episode in several respects. For one, I loved the show's use of Ted and The Mother's first date as a frame story, and the way that it used that as a device to tell stories within stories (e.g. Ted telling her the story about when he was at the wedding telling the story about how he met Gary Blauman.) One of the deftest strokes of Season 9 is how it filled in the gaps of Ted and The Mother's future together little bit little to where by the time they meet, we get a pretty complete, if abbreviated picture of who they are. The two of them continue to be cute together, and the fact that Ted didn't blurt out an I love you (among other callbacks to the pilot here) and the way it led to Ted and The Mother's first kiss was well done and downright heartwarming.
But it wasn't all warm fuzzies! I often complain about the broadness of the show in its later years, but I have to admit, as exaggerated as it was, I loved everyone milking the reveal as to whether they were going to say "love" or "hate" (or some variation) when it came to how they felt about Gary Blauman. The various flashback stories about him were fun (especially all the dorky Teddy Roosevelt jokes between Ted and Gary), and Marshall's impromptu courtroom bit was a fun touch as well.
The show also found a really nice way to give closure to a wide swath of its secondary and tertiary character without it feeling forced. Many of them were cute or clever (Scooter ending up with Stripper Lily and Jeanette ending up with Kevin were oddly perfect) and the fly-by device gave everyone a moment without overcrowding the episode. On top of that, tying those little updates with the theme that friends drift apart and if you care about someone, you have to hold onto them, and having that pay off in the story of Ted and The Mother's first date (with The Mother making the move!) was a really neat way to handle it as well. Overall, a nice lead-in to the finale.