The notion he was a bad ball hitter was perhaps true, but as Knight said he rarely struck out. DiMaggio until his final season had more career home runs than strikeouts. Berra I believe hit 358 home runs and struck out about 450 times, an incredible ratio for a power hitter.
Berra also figured in the top 25 of mvp votes every season he played as a full time player, exhibiting remarkable consistency.
Behind the plate he was initially shaky but the Yankees brought Bill Dickey to spring training to work with him and Berra work so hard he became a great defensive catcher, especially adept at pouncing on bunts to throw out runners.
In his 80's he could still recall pitch counts and sequences against batters in important games or moments. Incredible recall for someone portrayed as not very bright. In that regard, Berra once remarked, "I did say most of the things I said."
One blight against his judgment was that for years he was adamant that he had tagged out Jackie Robinson in his world series steal of home. More recently computer enhanced imagery of the video proved that Berra was correct.
A beloved Italian American icon, not unlike our own Looie.