IMO- 10 is perfect on all fronts... not perfect for attempting something and succeeding. If it's not trying to do much... it's not trying to do much- so lower grade. my favorite movies- Wings of Desire, 7 Samurai, The Third Man, Dr. Strangelove... I'd put those up there as 10s. 7 Samurai for sure.
I think I am with this, but with a little bit of my favorites sprinkled in, so I am sure that up and down my rankings it is a little inconsistent.
For me:
10/10 - One of the best movies ever. Some of them would be genre specific too. SO I would have movies like Psycho, Boogie Nights, and Back To the Future up there. Basically my top 30 or so movies of all time.
9/10 - Excellent movie. Maybe not best ever, but more like best of the decade. Movies like Eternal Sunshine, City of God, or Sweet Hereafter would be here.
8/10 - Great movie. Not best of decade, but would be on a list of best of the year. This could be anything from Pulp Fiction to The Lego Movie.
7/10 - Good movie. I really enjoyed it, would watch it a few more times, but not best of the year. 21 Jump Street
6/10 - Above average movie - I liked it, and would probably watch it again if it was on HBO or something - Pitch Perfect
5/10 - Average movie - liked it, but probably wouldn't go out of my way to watch it again - Guardians of the Galaxy
4/10 - Below average movie - I personally didn't like it, but I would probably still recommend it to people that I think would dig it more. Pacific Rim
3/10 - Bad movie, but I was able to get through it. Wouldn't recommend to people. The Happening
2/10 - Crap movie, but I FF to a least see what happens - GI Joe
1/10 - Total #### - I couldn't even be bothered to finish it. Tammy or Into the Storm
I think a lot of movies fall into the 6/10-7/10 range for me, especially movies in the horror, rom-com, or comedy genres as I don't elevate many of those into a "best of the year" category.