For the Wall-E Top 5, here are some ideas:
Top 5 Movies About Robots/ Favourite Movie Robots
Top 5 Modern Silents (Modern era films with very little dialogue)
Top 5 Anti-Consumerism Films
Top 5 Sci-Fi Comedies (is this one even possible?)
Top 5 Visual Enlightenments (The top movies that personally redifined the bar for cinematic visuals. eg Dr. Caligari, 2001, Gone With the Wind, Children of Men, Amelie, The Fall)