Technically a good match is when both player fight evenly until the last round since it only means that they are match for this fight and the idea boxing fights in technical perspective.
If you are looking for a K.O/TKO fights then that is the not good match in technical perspective because they don’t have a close combat skills.
It was an evenly matched fight because Pacquiao is old and Barrios is the level of a Jake Paul opponent. Neither fighter was very accurate or did much effective damage to their opponent. You can argue that it was still an intriguing fight nonetheless, but it was very obvious how much Pacquiao has faded and how lacking in skill Barrios is.