Don't like the fourth down call either, but the great blitz call by the Ravens affected it. I'm fine with the no-call on Crabtree - there was contact, but every referee swallows his whistle there.
I agree with your entire post. The playcalling was terrible.
As for the last play. It was a decent play call, but Crabtree simply has to get to the spot. Jimmy Smith was playing the slant and in that situation Crabtree should have faked inside and faded to the endzone to complete the catch. Instead, he didn’t get off the snap clean and allowed himself to get jammed. For the most part in that situation a ref isn’t going to call holding.