UK climbing ace John Dunne tweeted about The Bumper Book of Climbing Fun
"A good read" is what he said.
No, you're right, not very effusive, but he is from Yorkshire. Yorkshire is the English county where parents instruct their children like this (translated from the dialect into modern English):
"Eat all, drink all, pay nothing;
See all, hear all, say nothing;
And if you ever do anything for nothing, make sure it's for yourself."
So I think John really loved it, don't you?