For my own personal taste, I'm just not a huge fan of projection shows. The first time I saw a building used as a projection screen, it was really cool, but it's gotten less cool with each new application. I much prefer things really happening in the space I'm in than simulations, which is why I prefer AAs and sets over screens and motion bases.
All that said, taken as a projection-based show that uses fireworks as an enhancement, the way it uses lasers and other lighting, I think this show looks really good. It's well-designed and uses the materials available to good effect. Taken as a fireworks show, though, the show is lacking. I think Disney needs to manage the expectations on this--not lower them, exactly, but make sure people know what to expect. It looks like that's what they are trying to do on the official site: "State-of-the-art projection effects, dynamic lighting, lasers and pyrotechnics light up the night like never before!" The fireworks are the last thing mentioned. It would be better if that web page wasn't titled Star Wars: A Galactic Spectacular Fireworks, though.