Ron Darling is and always has been a terrible announcer. Can't stand him. Shows here that he doesn't understand the rules, and in Game 5 of the Cubs/Nats series he showed that he doesn't even know the rules. Wieters was complaining about getting knocked in the mask with the bat, meaning the ball should have been dead by rule, and Darling flat out said he'd never heard that was a thing and the broadcast just moved on.
Lacking charisma and knowledge. Just a blowhard who likes to sound authoritative about everything, which some producers still think make a good announcer, but I think his time is over.