I personally wouldn't want to review for 12 hours straight, but if someone else wants to that's fine. I'm sure that there are much more than 1500 close-worthy questions on the site.
The queue currently sits at 4.3k, so they did the site a favor as far as I'm concerned.
Since this was done in a review queue, you can presumably audit them to see if you think that they were incorrect. Unless there's proof that they were making a large number of mistakes, I don't see what the problem is.