I'm all about having an immersive experience.. but if you think about it, the first preshow is completely pointless... Having Rey/BB8 explain an entire mission and storyline for 3 minutes just for you to get intercepted in the next preshow (changing the entire premise of the attraction) feels wasted to me.
I know the general public will disagree w me, but honestly I feel like having 3 pre-shows is a bit excessive and unnecessary. I think it will be cool, fun, and immersive for the first few times you ride but annoying after that..
The ITS shuttle seems awesome, and the pre show in the detention cell seems necessary as that is most likely where you'll get all of your vehicle boarding safety spiels... but the first one seems redundant..
after a couple months, the hype will die down, and I can see myself saying "ugh just get me on the damn ride already"