Reviews under the "All Reviews" tab began to be collected on January 18, 2016. Not every review for a 2015 release is collected here but a good amount of them have been.* Starting January 18, 2016, every review written will be collected under here.
*Once I've seen every 2015 release I plan on seeing, I'll release a complete list of every 2015 release I saw with the grade I gave it.