I ordered a cheapo lightbox off of Amazon, and it came much better than I expected. Pictures for products should now be much better lit.
Update (3/19/17 2:15 AM EST): I am periodically updating the images for all reviews on the site. All but two should be up by the end of the night, but the Quiet Comfort 25s and Xiaomi Piston 3s are out of my hands right now, and should be up within the next few days.
Update (3/20/17 11:30 PM EST): All pictures and thumbnails are now updated.