Went to see Ready Player One on Wednesday, and I really enjoyed it.
I felt trepidation during the first half an hour, as they began changing stuff from the book, but after a while, I realised I didn't care - it's still a damn good film on its own. Spotting all the little references to pop culture was really good fun, especially during the final battle - such as spotting the assault rifle from Halo being used, or the chainsaw gun from Gears of War.
I would give it 8/10.