james5272: Stun a guy and he's stunned for 5 seconds. Next time I stun a guy, they're stunned for half a second.
Never heard of this happening before.
james5272: Do an attack and I stop to stand still for a second, leaving me completely open. Roll and the guy swings at air after I roll, I still take damage.
The first makes sense, because your character has momentum. It's not a hack-and-slash game where you can click furiously without thinking and have your character react instantly; you have to time the strikes to give yourself enough time to get away, and in that sense it's more realistic than most games. The second isn't something I've ever heard of or seen. Maybe you still have some issues that weren't solved by reinstalling? You might try asking on the official forum to see if anyone can figure out what's happening.
james5272: Can't drink a potion during combat, need to load an earlier save and do it now that I know danger is coming, but I can slap on grindstones and oils whenever I feel like it.
Totally agree that being able to use grindstones and oils in the middle of a fight is stupid. Not being able to use potions in the middle of fights makes sense for the same reason that the grindstones are illogical, and it's too bad there's no consistency in that respect. You should use potions before running around as a precautionary measure, because it makes no sense to run through a world full of danger without any protection just because there isn't a clear "baddie be hurrr" sign. Besides, there's nothing you can't run away from in this game, excluding a few rare bosses, and bombs are far more versatile than potions, anyway.