I stopped tracking my workouts and only use it, begrudgingly, when I go for a run or bike, which has its own set of problems.
Reading of metrics during a workout is buggy. Previously, whether it was a run, walk or bike, the music would be lowered and the metrics read out. Now, it will pause the song, which is fine, and read out metrics only on a bike, it stopped doing it on walks or runs. I've gone back and adjusted the settings, turned it off and on again, and neither fixed the issue.
Playlists stopped playing. This may or may not be connected to the workout app directly, and it may be an issue with the music app. My playlists stop at the end of each song and I have to manually hit play for the next track to play. The only solution is to reboot my watch. This lasts about 4-5 sessions before I need to reboot it again. This is absolutely frustrating especially during a run.
My work around is I added a 5 second intro to each of the playlists. I will start the music playlist before I begin my workout and if it plays to the next track, great, if not, I reboot my watch and that fixes it. Then I begin my workout. Incredibly annoying.