McLane has his faults as a baseball owner, but overall has done a very nice job.
To my knowledge he is an honorable person. My granddad started and ran a Houston grocery chain for 30+ years. He did a lot of business with McLane. In fact, my granddad was the one who suggested to McLane that he buy the Astros when my grandad's investor group's offer was rejected by McMullen. They were good friends. My granddad had a very high opinion of McLane's character -- he told me that McLane was the type of man who was very trustworthy and whose handshake promise would stick.
Any public figure, especially someone as wealthy as McLane, is going to get criticized by anonymous internet posters who claim to have personal knowledge of all his shadowy secrets. (Of course they lack proof to substantiate such claims and often refuse to even detail the vague/unsubstantiated claims.)