Nah, Cars 2 is fine. I haven't seen Coco, so I can't rate it. But Toy Story 3 is fantastic, so it would take the next round anyway. For me:
Round 1:
The Lion King vs. Tarzan
The Princess and the Frog vs. Lilo & Stitch
Tangled vs.
Big Hero 6 (this one was close; tangled was a REALLY cool reimagining of Rapunzel)
Frozen vs. Moana (I enjoy Moana, but can't imagine it having much staying power)
Aladin vs. Hercules
The Little Mermaid vs. Pocahantas
Mulan vs. Zootopia ("Someday I'll make a man out of you!"--this one was actually pretty close)
Beauty and the Beast vs.
The Nightmare Before Christmas (TNBC is a cult favorite of mine, so it will take a lot to take it down)
---
Up vs. Brave (close call, but the first ten minutes of Up give it an emotional impact like no other)
Toy Story vs. Toy Story 2 (they were both good, but the edge goes to the original)
Coco vs.
Cars 2 (I haven't seen Coco, but I enjoyed Cars 2 enough)
Toy Story 3 vs. The Good Dinosaur (not even close)
Ratatouille vs. A Bug's Life (I like both of these, but not crazy about either)
Finding Nemo vs. Inside Out (Inside Out is fantastic, but Finding Nemo is my favorite)
Monsters, Inc. vs.
Cars (So hard! I love both of these!)
The Incredibles vs. Wall-E (Wall-E may be my least favorite, and The Incredibles gets massive clever points)
Round 2:
The Lion King vs. The Princess and the Frog (sorry, Tiana)
Big Hero 6 vs.
Frozen Aladdin vs. The Little Mermaid (tough call, but Aladdin was really fun)
Mulan vs.
Nightmare (I hate to see Mulan go this early, but the seeding is what it is)
---
Up vs.
Toy Story (aw...
)
Toy Story 3 vs. Cars 2 (landslide!)
Ratatouille vs.
Finding NemoCars vs. The Incredibles
Round 3:
The Lion King vs.
Frozen (Frozen still chokes me up, man)
Aladdin vs.
Nightmare--
Toy Story vs.
Toy Story 3 (speaking of still getting choked up...maybe this is considered a big upset, but 3 still makes me cry at the end)
Finding Nemo vs. Cars
Semis:
Frozen vs.
Nightmare (controversy!)
Toy Story 3 vs.
Finding NemoFinals:
Nightmare vs.
Finding NemoThat was ridiculously fun.