I enjoyed the reunion, I couldn't stop smiling all through that introduction where they walk into the set one by one. You can tell they obviously share a strong bond and friendship, but it always feels like they either don't enjoy talking about it in public or maybe it's not the kind fo friendship people expect it'll be, so they're scared to disappoint? They seemed very pleased to emphasize this was basically the last time they'll ever be doing a reunion or anything big related to the show.
With that in mind, it's a shame time was wasted on things such as the celebrity cameos, the international segment, that runway... and I love gaga but it was so random in the context of the show. I understand why they did it, but I'd rather they filled that time with more behind the scenes stories and footage, or longer time spent talking to the show's guest stars (it didn't feel right that Jack and Judy only got to say hello from the audience seats, having Janice sit on the edge of the sofa and barely even interact with Chandler, not having Gunther interact with Rachel).
It was so interesting seeing how they worked in real time while filming back then, learning that Monica and Chandler's relationship grew from the live audience feedback, what went on behind the scenes in The One Where No One's Ready... they should have leaned into that some more!