Ross A. Lincoln, writing for Movieline, on the huge robots in Pacific Rim:
We want them so badly, but could we have them in real life? Unfortunately, hell no. Not because of budgetary constraints, frustratingly missing confirmation of alien life, or the lack of a decent fuel source. There’s a bigger problem facing these robots than any alien invasion: Physics.
Yes, the terrible dictator that ruins everything from warp drive to immortality also has a bone to pick with Del Toro’s supersized combatants. And unfortunately, as inherently awesome as it sounds, having giant robots brawling with giant monsters in regular ol’ planet earth gravity runs right up against the twin problems of weight distribution and the nefarious square cube law.