Someone has been voting to close a ton of old questions in the past couple days. The review queue jumped from about 40 (for me) to over 100.
I don't disagree with whoever (*cough* noob *cough*) is casting the first vote - so far every question I've looked at I've also voted to close - but I worry that it's counter-productive to load up the queue with so many old questions at once. Since there are very few people (other than *ahem* me) who do the maximum 20 reviews per day, I think the close votes might age away before enough people get to them.
Also, I feel like older bad questions are less of a problem... if they've been sitting around stinking up the place for a few years already, I don't think having them open a while longer will matter.
OTOH, if people do want to get them closed quickly, you can do what I sometimes do: while reviewing, click through to the actual questions and vote to close it there. That won't count as one of your 20 reviews per day.