The Invasion was an unwatchable piece of shit. I understand Aeon Flux was much the same. Talented directors on both films, studio troubles, but in both cases I questioned the overall production in addition to the interference.
PG-13 is both restrictive and fluid today, IMO. Yes, a lot of what was R back in the day might get 13 now. Or, a lot of what was 13 then might get R now depending on the whims of the MPAA that month. I think a PG-13 cut could still be quite fierce, and I could take it - they still let a lot of big studio shit slide with violence and intensity here, IMO it's often the smaller films getting f**ked. But I'd just as soon an R.