Best two reviews:
1) RogerEbert.com- I didn't come out of this one feeling depressed or even particularly sad, more reflective. The sheer breadth and depth of this series creates its own sort of poetry, one that's strangely indistinguishable from journalism. (Rating: 100) Read Full Review >
2) - People change, some more than others, but 63 Up is so beautiful and bittersweet for how it finds them becoming who they are. Hopefully many of them live to enjoy it, and this series continues for a couple more decades to come. (Rating: 100) Read Full Review >

Worst two reviews:
7) - The film (which isn't a good place to start, for those new to Up) is far from a downer; it suggests that the next installment (and hopefully a couple after that) will have the feel of warm, sometimes bittersweet family reunions. (Rating: 70) Read Full Review >
8) - If this is the final chapter, as Apted suggests it could be, it’s a worthy cap to one of the boldest experiments in world cinema. (Rating: 70) Read Full Review >