I'm only going to do best since I don't think I could really form an overrated list with any sort of authority. Also, my best list is more a list of my personal favorites.
Best
1) Gravity
2) Blue Jasmine
3) 12 Years a Slave
4) Star Trek: Into Darkness
5) Short Term 12
6) American Hustle
7) Kick Ass 2
8) The Way, Way Back
9) Fruitvale Station
10) This is the End
Explanation/Response to Tdigs
Elysium definitely belongs on the Over(something) list, but I'd say it was more overhyped than overrated. I was one of the many that was super stoked for Neill Blomkamp's follow up to the phenomenal District 9, and like virtually all of our kind, I was disappointed in Elysium. Damon was boring, the story was mediocre, and the visual effects, while spectacular, didn't make up for the fact that everything else in the movie was unspectacular.
American Hustle doesn't deserve to be on the top of your list. I agree that it's overrated, but that's only because the, "Everything Jennifer Lawrence Does is Fantastic," train is still going strong (though perhaps it should be), and because David O. Russell actually made a movie that was just as good as (if not better than) his hit Silver Lining Playbooks. American Hustle will get plenty of attention from the Academy, and it definitely should. Is it the best movie of the year? No.
I also don't think Fruitvale Station belongs on the overrated list at all. Considering this was Ryan Coogler's first feature length film (and clearly had the budget of a guy doing his first feature), this was a huge success. I honestly can't name another director that made such a fantastic feature on their first go of it.
Gravity was the best movie of the year for my money... literally. I saw it twice, and both times it was amazing. Those visuals were just unbelievable, and it took very little suspension of disbelief on my part to believe that they were actually in space.
Blue Jasmine should be higher on your list. If Cate Blanchett doesn't win the Oscar for Best Actress, the system is broken.
I probably wouldn't class The Hobbit II in the top 10 best films of the year, but I wouldn't put it in the overrated category either. But considering this forums' ridiculous anti-LOTR/Hobbit base, expect some rebukes for that one.
I liked Dallas Buyers Club a lot, but I can see why one would call it overrated. McConaughey and Leto will get nominations for their work, and they both deserve it, but their acting is what really drove what was otherwise a good, but not great movie. Still, I'm of the mind that a couple of great performances can and should elevate a film from good to great.
I haven't seen a few of the films on these lists, but I'd be tempted to throw Star Trek Into Darkness onto the best list. The first installment of Abram's Star Trek was entertaining, but I was never hooked the way Cumberbatch's Khan had me hooked. I reckon that Khan may be the best movie villain of 2013, though a case for Fassbender's Edwin Epps could be very easily made.
Your best list is a little light on comedy. I guess it wasn't a great year for comedy (though there are no shortage of laughs from Blue Jasmine), but I really enjoyed The Heat, which I saw as a spiritual successor to Bridesmaids.
I'd also like to give a big shout out to Short Term 12. If you haven't seen this movie, get on it. Brie Larsen puts on a great performance in this sweet, but very serious movie about troubled children in a recovery center. That would probably me on my best list.
Also, I really liked Kick Ass 2, so fuck you guys.
