Well, I've successfully and easily broken the geometry of the game three or four times now. It's fun to climb a rock you're not supposed to and see that Nihilistic did jack shit behind the environment. Case in point: the bridge level. Climbed on top of a truck that a Chimera was on (which, holy hell, that was easy to get on top of) and there was no bridge or any texture on the other side. Just a void of brown.
I'm... enjoying the game so far. No buyer's remorse (yet), but it saddens me that I'm normally slow to finish my game (1.5 weeks for WipeOut, 3 weeks for Uncharted, 2 weeks for MK, still not done with Rayman, 3 weeks for ModNation), and I'm halfway through the damn campaign ~24 hours into owning it.