I don't know what he did behind closed doors. I doubt his demons were any worse than Mickey Mantle's or Babe Ruth's, but when he stepped out on the field in the presence of fans he couldn't have been a more exemplary human being. He signed my then 5 year old cousin's baseball before a Ranger game, and didn't just sign it without muttering a word in assembly-line fashion as per usual, but took the time to shake his hand and ask him what position he played (he was in his little league uniform). He really made him feel like the only kid in the ballpark.
The 60's will always be known as the golden age of baseball, but there was a great collection of HOF caliber baseball players from the pre-steroid late 80's - early 90's who played the game the right way and were very easy to like. Kirby. Sandberg. Gwyen. Larkin. Mattingly. Ripken. Winfield. Gibson. Orel. Biggio. Ozzie. Molitor. Joe Carter. Yount. I think history is going to look back fondly on that era of baseball.