I thought the returning celebs routine was one of the best parts of the whole show. Even the complete duffers contributed well to it and it was really entertaining
I thought it was pretty poor in terms of actually showcasing the best routines of the individual dancers, particularly Jake & Janette - the most recently eliminated couple aside from the finalists used to get a bigger spotlight bit towards the end of the group routine iirc.
I thought it was good - it nicely captured the memorable bits of the various celebs and just stayed simple and fun - had a real feel of the end of show party about it.