*SPOILERS AHEAD*
I've personally tried the ride yesterday, and I must admit I've been quite disappointed, you can see so much missed potential with this ride.
When I rode, they were running 2 trains, but with slow operations due to the technical problems mentioned in previous posts.
My main gripe is the lack of thematic elements during the ride, and the overall brightness inside the room, as you can see the whole track and the structures for the few screens scattered around. Most in my group agreed that it feels rushed, and Uncharted suffers for it.
It feels like the budget goes down and down as you walk from room to room in the queue line, with the lowest quality theming in the coaster itself. There are still some nice effects in the queue line and the animatronics are solid. The screen quality and animations are solid, too.
Overall, the coaster itself is quite fun, good forces for a family coaster, the launches and spinning are great, and it's a very smooth ride. My highlights would be the first launch, the lateral launches and spike, and the backwards drop into the break run.