I loved it. Charming and true to the film. Great family ride. If they opened in the swamps they would be marketing as the greatest thing ever. I would have liked a few more physical sets and/or AAs ... but it absolutely is quality and works. And people absolutely love it. I think Angie and I rode it about six times. And the new restaurant is excellent as well.
After riding both Mystic Manor and Ratatouille in a 3 months span, I feel both served the same purpose while taking whole different directions art wise. Quality wise, I am probably the only person in the world to not have be blown away by Mystic Manor and I would put Ratatouille on the same level. The only flaw I have with Ratatouille is the botched up screen/set integration throughout the ride. It is basic stuff that Universal, Sally Corporation (for Six Flags) and Falcon's Creative Group (for Busch Gardens Williamsburg) have much more successful in that aspect. Beside that, the feeling internally is that WDI overcharged for the ride: 150 million euro for the whole mini land.
Listening to the guests around the park and based on my Disney newbie friend I took along this trip, the ride is a runaway success! I am almost ready to say that it saved the Walt Disney Studios park in the sense that it is now driving a lot of attendance there. With the signature restaurant and shop, it made guest visits to the park much longer and closer to a real full day experience.
Maintenance wise, it is now a lot more reliable, but the lenghty "breakdowns" are not all Disney or the ride's fault. The local safety commission does not allow Disneyland Paris to reset any ride vehicle or train with guests on them anymore and it has slowed breakdown resets to an halt. Best example: the common Space Mountain breakdown in 2000-2001 took 15-20 minutes to reset as only the trains in the catapult (the Cannon) had to be evacuated and then, the ride only took a few minutes to reset. Now? It is 15-20 minimum as every train have to be emptied before any train start moving throughout the process. In the case of Ratatouille, it is the same thing: few minutes to reset a stalled Rat.... but you need to evacuate so many rats you're looking at 45-60 minutes minimum to reopen the ride.
One last thing, the "Security with Assault Rifles" are not security guards. They are french soldiers patrolling airports, train stations and other public areas as part of the "Vigipirate" plan that has been going on for years in France.