I'm going to flat out say if the entire movie were as good as the last 30 minutes of this movie this would have been an easy 10 out of 10 (Or Golden Star since that's my highest rating), but the first hour and a half isn't, but that doesn't mean it wasn't good and entertaining. I really enjoyed the movie as a whole though, my biggest complaint is they could have done a lot more with Randy (Randall) than they did in this movie, they could have delivered a lot more heart to his character and why he went from how he was in the beginning in this movie to the end (unlike the way they did it). I also found MU really funny (especially some of the ending bits, that's where I laughed the hardest) and laughed harder at points (though not as consistent) as, good, full-out comedies like This is The End (Really good actually). The performances and animation were obviously great (I mean obviously they are, it's Pixar), and I honestly thought this was a very solid step up from Brave, although it did not restore Pixar to their glory days, it got close at points but lacked the consistency. Overall I loved parts of the movies (yet the parts I loved were outweighed by the parts I merely liked), but I can say this movie did prove Pixar can do prequels right, unlike 99% of the prequels out there. 8.7/10 for MU (But I will say the last 30 minutes of this movie was probably some of the best stuff I have seen in theaters in 2013)
Side note: The short before the movie was really good and worth seeing (the CGI-animation was absolutely stunning with how real it looked).