I think ARTPOP will be in the 70s when its all said and done. Artists, mainly pop, that are not usually favored by critics usually get great scores at first but then the overall score will decrease in time, it may be because reviewers that love them will rush to make their reviews and give their scores, the others don't want to waste their time to trash the album so they will do it when they have free time.
ARTPOP won't get to low and I dont think Tiny Mix Tapes will **** up again
