I feel like rube was one of the early Intimidator type pitchers. He was tall, and when he did well he did really well.
I know most stories make him sound goofy, but I'd think some players on the other team might think those goofy stories are so weird that they are a little scary and that rube was a bit mental. Pair that with a large frame and his great fastball I think players didn't look forward to facing him.
This Bregstone postcard to me shows that the best of all of his cards.