This isn't a problem because a single bad review doesn't outweigh many good reviews. Something I think the next generation of reviews should take into consider

This isn't a problem because a single bad review doesn't outweigh many good reviews. Something I think the next generation of reviews should take into consideration, though: places change. A place that used to be good can take a turn for the worse, and a place that used to be bad can improve. Besides an overall rating, I would like to see how the most recent reviews assess an establishment.