I honestly believe, and I'm not the first one to say this, that expectations for new attractions will lead to disappointment for many. If your expectations or either to high or expecting something completely different from reality, you'll leave feeling disappointed. Even if insiders who are in the know tell you to not expect much, people will still raise their expectations to a level that they want to see, which is not always realistic.
This happens way to often in theme parks in my opinion. For example, Seven Dwarfs Mine Train was considered a failure by many fans and guests not because it wasn't well done, but because it didn't live up to their expectations. Some people (not all) were expecting either at least a thrill ride with a level of thrill similar to Big Thunder Mountain or a lengthy dark ride. Going in, we knew that both of these ideas were false, but people still made these assumptions anyway. SDMT is meant to be a family friendly coaster with a single scene inside the mountain. Now, I know plans were more ambitious initially, so that could have also been a factor. However, when I rode it for the first time, my expectations were just normal and not into the atmosphere because of the negative reviews. However, I was left completely impressed, because I got exactly what I was expecting.
Bringing things back to Universal now, the same thing could be seen with Gringotts. Especially with FJ's success most people were expecting a massive, high quality coaster through the caverns. But, what they gave us was a family friendly mix of Spider Man and Mummy. Again, I'm going to Universal this summer and hoping to be pleasantly surprised by this attraction by keeping my expectations out of the sky.
Now, I know that it's easier to do this when an attraction has been open for over a year and you know what to expect. But, if insiders are telling you not to get your hopes up and what kind of attraction it will be, it's best to listen as hopefully you'll be pleasantly surprised by the attraction going in with normal expectations.
And that's key, don't go into the attraction for the first time expecting a heap of garbage. Be excited for it and look forward to riding that first time! That's one of my favorite moments, riding a new attraction for the first times. Personally, I look forward to riding Reign of Kong for the first time! Just don't prepare for something that is completely different from what is given or expect an out of this world attraction.