I think the concerns are valid. If you don't live in SoCal, you hope that a brand new attraction will still be working near 100% when you visit. I always felt that this ride looked much better than I expected, but it's "awesomeness" depended on a lot of pretty big animatronics working. Those have already proved troublesome, and as a result, the ride quickly becomes a Mr. Toad with a medium speed outside section. Hardly a $200 million attraction, in my opinion.
It seems the tractors are too big to handle the repitition, and the Maters are wonky. Those two things were also the main things mentioned by everyone when they talked about how amazing the dark ride portion was. Add in the two parallel effect rooms being out of sync, some mouths being off, and the final big animatron not working, and I really don't see this ride being anywhere even close to what it was hyped as being during the first few days.
I think its understandable that someone paying a few hundred dollars for thier family to get into the park, and waiting hours for the most expensive ride Disney has ever built, expects the ride to deliver that vast majority of its best special effects.