I was told as a young player by my coaches to watch all the good teams like the Yankees, the Cardinals and the Orioles because that's how you learned to play baseball the right way.
But as an adult and as a career coach, what I have found is even more effective is watching bad MLB teams and what they did wrong. I can then make sure at practice the next day that my high school team doesn't repeat the poor execution and mental mistakes that always seem to happen to poorly coached teams or coaches that rely on skill and athleticism and ignore baseball strategy and fundamentals.
I watched a three-game series between two non-contending teams recently and started to take notes about missed cutoff throws, poor baserunning and leads, slow coverage by infielders of bases on steals, lack of discipline at bat in RBI situations and the inability to get a batter out by pitchers ahead in the pitch count. At practice I made sure I went over everything I saw that was executed incorrectly or ignored and did it correctly in detail.
As a coach a lot of good can come from watching bad.