Simplify the following text for a Grade 7 native English-speaking person.
Original: Despite receiving mixed reviews upon release , 2001 : A Space Odyssey is today thought by some critics to be one of the greatest films ever made .
Simplified: It received some good and some bad reviews when it was released . Now 2001 : A Space Odyssey is recognized by critics as one of the greatest movies ever made ; a poll of critics in 2002 placed it among the top ten movies of all time .