This was fricking DREADFUL. Never has so much been spent on something so perfunctory and bereft of emotion, drama or even basic logical sense. I haven't read the book this is based on, but pretty much everyone who has said this is a horrible bastardization of the text, and it would have to be. When Stanley Tucci's stock Heartless Scientist villain intones "The world is a tire fire, floating on an ocean of piss", I couldn't think of a recent line that worked better as a perfect encapsulation of the movie that contained it.
Millie Bobby Brown continues to demonstrate that she'd rather be doing anything other than acting (and she's aging faster than any barely-out-of-her-teens actress since Lindsay Lohan), Chris Pratt mugs and quips like a jackass (and looks weirdly like Matthew McConaughey throughout), the special effects are technically fine, but don't do anything you haven't seen a billion times before, and the "emotional" parts fall completely flat, despite a hard-working Alan Silvestri score that's the best thing in the movie by a country mile. Absolutely awful, and a miserable waste of resources.