Great pacing is when each scene flows into the next. By the end of the film you feel like youve been on a ride the whole time. It doesnt just apply to action though.
It is definitely subjective to an extent. An example of disjointed pacing imo is the safe house scene in Avengers age of Ultron. We get introduced to Hawkeyes family and the whole film just kind of resets.
Wink wink oh oh wink wink