Some added context for why Ratatouille doesn't work for EPCOT specifically:
Ratatouille in Disney Studios Paris was meant to add more capacity/interest in multiple aspects of the park's experience; including rides, dining and retail. That's why Place de Remy has all three. An important thing to remember about Disney Studios Paris is that...there's nowhere to eat. When I last visited the park, the only where to get food besides ODV carts were the cafeteria in Studio 1, the buffet restaurant and the Ratatouille restaurant. That's it. Backlot Express is often closed, as is the tiny diner near the car stunt show. Disney Studios Paris isn't just a park lacking in rides, it's lacking in EVERYTHING. Place de Remy was another band aid for the park to give it not just more theming, but give guests more things to do in general. In that context, it serves its purpose quite well.
The ride itself is essentially an ad for the restaurant. You end the ride by seeing Remy there, and then the car turns and you see PEOPLE in there, in real life. The experience doesn't end on a screen at unload, it continues with you spending more time in Remy's world. Now the integration of ride/restaurant is not as good as San Angel Inn, or Blue Bayou/Lagoon, but it works at getting people's attention. From the exterior, you may not even know the restaurant is there unless people are sitting outside because you can't see through the windows into the dining room. The ride is about making your way to the restaurant, and the various mishaps along the way.
Now dining capacity is not a problem for EPCOT, which has an insane number of restaurants by any standard, including two already in the France pavilion. I don't blame them for not copying Chez Remy in Florida, but that ultimately makes the ride somewhat pointless. The setting of the ride doesn't correlate with anything else in the pavilion. The France pavilion isn't the Pixar Paris, it doesn't have any other references to Ratatouille the movie. As already mentioned, the ride's narrative wasn't changed to fit the park, so we walk behind the pavilion to take a journey to Remy's restaurant that ends in...a wall. It's conceptually lazy because the big reveal at the end (that you can visit Chez Remy for real) is gone. It's more like a ride-through of the movie's teaser trailer now. I guess that's fine, but considering the ride is several years old now, you'd think they could do better. This is to say nothing of the odd design of the expansion or the Crepe Restaurant that aesthetically and thematically feels removed from the rest of the park.
Floridian Disney fans are excited because the ride is new and many were never going to make a trip over the Atlantic to visit Disney's second-tier, second-gate, but considering how much EPCOT deserved a truly amazing and unique ride, it's incredibly disappointing that all we got was clone of what was far from Disney's best new ride of the last decade.