Looking at vids of the Incredicoaster, oof. As others have said, this is a "Solution" in search of a problem. (Which can honestly be said about all of Pixar Pier.) California Screamin' was totally fine the way it was, it was a modern day nod to the classic wooden coasters of boardwalk/seaside parks, and it did it very well. It wasn't trying to tell a story or anything fancy, it was just a really nice coaster.
The Incredicoaster on the other hand, it's shoehorning a half-baked story onto the coaster and trying to tell it even though the coaster was never made to tell one in the first place. It comes off very disjointed when the only bits that are really telling the story are the tubes. Speaking of the tubes, the only tube that's interesting is the last one with firey Jack Jack and Violet, everything else is not good.
I know people were excited for the score by Michael Giacchino, though for this ride it doesn't seem to stand out like say with his work on Space Mountain. Not helping the matter is it's often interrupted with dialogue, seriously there's a lot of chit-chat from the characters on this coaster. Less is more, since I remember when Terminator: Salvation at Magic Mountain tried having a dialogue heavy soundtrack, yet all you could really hear was "Take the Tunnel."
As with Pixar Pier itself, the whole thing wasn't needed. It's slapping a IP on the coaster just for the sake of slapping a IP on the coaster. It's also a waste of the IP since the Incredibles are really suited for a full-blown dark ride.
Inside Out Emotional Whirlwind to Open in 2019 along Pixar Pier at Disney California Adventure Park | Disney Parks Blog
Looks less grandiose than the first concept art. Didn't the original one have a really large wall of memories surrounding the area?
Yeah, I recall the concept art had a really high wall a memories as the backdrop. Though it shouldn't be any surprise with things getting scaled/cut back.
Also, massive missed opportunity to call the ride "Mood Swings". If you were gonna' use "Emotional" in the title, it would be Emotional -Rollercoaster- for something like Goofy's Sky School.