Everything outside of Carsland has obvious budget cuts and is a degree below what Disney normally does, I think mostly because DCA 1.0 was failing miserably, and somebody thought they'd make a smart move by proposing a cheap attraction which would "save the day", and draw in guests. Only with Carsland do we see a commitment to Disney level attractions/theming. For example:
1. Mermaid. WDW picked the wrong ride to clone as they did a reasonable job with the queue but carbon copied one of Disney's "quick fixes".
2. Monters Inc. DCA ride. Not very good mostly because they re-cycled the old SuperStar Limo ride vehicle, which means you go uber-slowly through the ride and have the time to look at everything and you get bored, plus there aren't a lot of truly amazing scenes.
3. BVS. It looks nice, I'll admit that, and looked fantastic during Christmas, but compared to Main Street which has the train, cars, cinema, trolley, Great Moments with Mr. Lincoln . . . there is only the Red Car Trolley which is often taken over by entertainment for shows.
4. Toy Story Mania. Fun the first time, a nice little diversion the second, and after a while all you look forward to is the theming. If they had added half a dozen dark ride scenes, then it would have had something for everybody, IMHO, it's just a video game ride, and not a must-see in my book, though it is one of the better rides outside of Carsland. Would it have killed them to put in animatronic Woody or Jessie at the end, and perhaps each of the toys represented by animatronics in the ride? I guess it comes down to budget.
I think the reason why these attractions went half-way there is because Disney knew that DCA was failing and they didn't want to spend money on a park that would always be an adjunct park to Disneyland (in the eyes of many)