I thought it was OK, with some superbly done moments and good humour, but missing something to make me really enjoy it like I have some of their other stuff. I think it's down to some flaws in writing here and there. Hiro's (really, that's the name we're going with?) brother was so perfect and flawless I knew he was dead the minute he appeared. The ending had a couple of cop-outs that just weren't necessary and play out so predictably that there's no tension or drama to them.
Probably the most irritating part of the film, by far, was GoGo. Holy crap, I thought we left these overly-aggressive too-cool-for-school tough-girl stereotypes back in the 90s where they belong. I spent the entire movie wanting her to get crushed by something. If you have, with a straight face, written a character whose catchphrase is "woman up!", go back and try again because your subtlety circuits have completely failed.