I don't really agree. Saying "it's a roller coaster in a building" tells us very little about the experience.
More specifically, I think elements like the backwards launch and the directional movement of the vehicles will make this very distinct from the other rides listed. I also expect heavier use of actual "scenes" (via video) in making this truly themed to GOTG, which will make it very different from Space and RNR that are in low light conditions lighter theming. We know there is a planet/moon in the show building that you helix around. I also expect a big pre-show/exposition which will probably extend into the first part of the ride before the launch. I also expect since it is GOTG that there will be a good bit of humor involved, something that was done very well with Mission Breakout.
I also would expect it to be less intense than either Tron or RNR. Probably less fast, no upside down portion, and the sitting positioning won't be as atypical as Tron (or Space for that matter). In terms of intensity, I'm thinking more BTMRR than any of those indoor coasters.
Admittedly, I'm also one of those who finds it mind boggling that people complain about Tron being next to Space as being "too similar" cause they don't seem similar to me at all. I think there is a tendency in these forums to lump coasters all together as being similar experiences which is unfair while given dark rides more leeway in pointing out "unique" parts. My guess is that it is probably because (overall) people here probably prefer dark ride and expositional elements in general more than the physical thrills.