How strong and tough is power armor? I keep hearing stories that it can shrug off a ton of crap, making it look indestructible, but then I hear that a f-ing shuriken pistol can punch a hole in it.
No armour is completely impervious to damage, it always has weak points.
Suits of power armour are designed to withstand a lot of damage but there will still be areas like the joints where it's hard to give as much protection.
So a SM in power armour could withstand massive amounts of damage as long as that damage hits the right part of the armour, if, on the other hand, a shurikan pistol happens to be targeted at just the right spot the armour becomes useless.