And the total number of injuries are WAY BELOW MLB real life.
That would be the key point.
Look at your league's DL list. Look at MLB's DL list. I bet your league, minors included, are less than MLB.
Therefore, ANY complaint about injuries happening too often is probably going to fall on deaf ears.
One thing to remember as well; not every injury will hit the DL. I've got a pitcher that's 40ish health, and he has 3-4 injuries a year. Usually only one makes the DL, if that.