I'm not claiming it looks good, but you can definitely see 95% of things just fine, and where you can't, it's the editing and grading as much as it is the lighting.
It's done badly, but people exaggerate just how badly for comedic effect and believe their own jokes. The bit SM mentions during the opening on the Pred ship is probably the worst offender over all - most of the rest of the film just looks like shit but is entirely legible.