When writers say a reviewer "gets it", they mean the review is positive.
My novel, Brain Thief, is supposed to be a work of snarky humor which is also suspenseful. Needless to say, this is a difficult thing to achieve. The two mental states are somewhat in conflict. I still think it was worth doing.
Still, the suspense seems to have thrown some reviewers. Those people have to read too fast. Fortunately, you don't have to.
This guy understood it, and also quotes one of my favorite rants by Bob, the waiter at Near Earth Orbit, the diner where a lot of the story ends up happening. It's one of those reviews that really lets you know whether you would enjoy the book.