Yeah, I'm being cautious as well. It seems pretty polished and big budget by comparison, but none of that can replace the jokes that I guess aren't my taste or maybe I've just seen too many Star Wars parodies (1). For example, "show don't tell" could've been applied to the rebels, like the Janitors trying to get their attention but being outright ignored. Or maybe let the more down-to-earth Janitor continue cleaning despite the firefight and miraculously not getting shot, emphasizing he's not part of this world of action and maybe providing a snarky comedic contrast to the fierce action, in addition to his fellow janitor's "only sane man" contrast to the situation.
Also, only rely on a lot of 3D if it actually looks really good. It's fine to have so-so 3D in the background, but it's not good once it grabs attention. That includes the outro.
/two cents