I'm basing it off of The Simpsons Ride, Disaster Studios, and The Mummy. If I recall correctly, their last three attractions to open. Two of the three were (or are) hyped greatly by Universal and ended up being rather underwhelming. Disaster Studios sadly is the only one that didn't dissapoint, and that's thanks to Christopher Walken in the preshow, and that expectations were low to begin.
Every few years, Universal trots out it's next "this is our superior product to Disney", and it fails. The Mummy was somewhat a rebuttal to Rock'n Roller Coaster. Their domed fireworks hoopla (whatever it's called) was hyped up as the fireworks that will "blow Illuminations out of the water". The Simpsons ride was built for....well, I really don't know. Do they know? All three have been underwhelming, and I have no reason to believe that Harry Potter's Geekatronic Hoedown will be anything from the norm.
The one attraction that I give Universal credit for (Spiderman-which, btw, I think is the best ride in Orlando), was designed by a fella who now works for Disney. Coincidentally, he was also in charge of the Harry Potter project before the promotion.
Keep in mind, I have an annual pass for Universal (it's so hard to fork over a whopping $16 a month), and go there often, although not as often as I visit Disney as a guest. I try not to compare the two, considering Universal doesn't really belong in the same sentence most of the time.