As I read this, I realize that what you are talking about is what my son experienced when he played with the Northwoods, and is very similar to what he is seeing now in high A ball. Players come in and out as they are moved up or down, cut or in the next couple of weeks, traded. He has faced some guys who lived up their hype, and struck out some top prospects in embarrassing ways. Some of the towns they visit have been high quality, some have offered the visiting squad porta potties and a trailer for their clubhouse.
I feel like almost every experience every player has is valuable. It teaches you what things look like when they're good, what they look like when they're bad, and hopefully some skills on how to cope with each and even better, how to make a bad situation better. Great lessons for a baseball career, and for life.