I really am the only one who really likes this coaster
For me its probably the funnest coaster ride in the Universal Parks and has slowly climbed the ladder and is surpassing the Hulk as my favorite one on property.
When you get a good, smooth ride it's fun. But it's so inconsistent and I've gotten more rough than normal rides (and that's beside all the problems we've heard about). But even if I consider all of UOR's coasters at their best, Rockit is still not my favorite. I enjoy Hulk and Dragons more as coasters, and maybe even Mummy too, but Mummy being a hybrid, it's not a fair comparison. I will give you that I'd prefer a smooth Rockit over Woody Woodpecker or Hippogriff, though
As for the GP appeal, I do get it. I've had many experiences, most recently when some family friends came from over seas, and one of their kids kept constantly asking if and when we were gonna go ride the "Hard Rock" coaster
It's appealing in many ways. You see it before entering the park and it calls to you, the LEDs, the interactivity and the opportunity of riding to a song of your choice. It all sounds great, until you ride it and you get banged and shaken around pretty badly. We did not have the most horrible ride with them, but the dad and the two kids still came off it and mentioned how they liked it but it was pretty scary. On another occasion, I was with my cousin at the parks and he wanted to ride it like 7 straight times. Some were smooth, some were not. But being the big coaster at the Studios, coaster fans wanna do it.
If you think about it, the concept of Rockit has many things that make it super appealing to the casual visitor or the hardcore theme park geek... if only it was engineered and built well... It's the only outdoor coaster in this park, it's one of only two big coasters in the park, the interactivity, the music, etc.
With the amount of profit and investment capital that COMCAST is working with nowadays, and how much they want to put into the parks, I would cut my losses and get rid of it. It might even be possible to count it as a loss or whatever for their taxes. Anyways, I would do it in the least damaging way possible, maybe even build another big outdoor coaster in the MiB/Simpsons plot first, and then take Rockit down, with a solid replacement plan ready to go in, continuing their aggressive but smart building plans. That way they wouldn't lose that type of ride and the guests would not be as upset. This hypothetical coaster in the MiB/Simpsons plot could even be tied into Krustyland pretty well, if they don't have another IP that they could work in and get more merch sales out of.