ParanoydStyle
Peace Among Worlds
One of my house rules for 5E is that Elementals and Oozes are immune to critical hits and sneak attack, due to their lack of a discernible anatomy or vulnerable points.
I still allow crits and sneak attack for constructs because I figure that a clever rogue can find a weak joint or an exposed seam or whatever in a golem or automaton. I still allow crits and sneak attack for undead because in my experience almost half of the enemies you face in D&D are undead, and the 3.5 Rogue's inability to sneak attack undead, elementals, constructs, oozes, plants, and maybe one or two types I'm forgetting made the class essentially worthless in sometimes quite literally every other combat, but by far the biggest source of the problem was the undead.
But undead are really the only place there's a tension of any kind between my personal sense of "okay, that makes sense to me" and "this is how the game needs to be balanced". And I defer to the latter. I might amend my house rules so that INCORPOREAL undead are immune to sneak attack. While that's a bit fiddly, there is something very weird about the idea of backstabbing a wraith.
I still allow crits and sneak attack for constructs because I figure that a clever rogue can find a weak joint or an exposed seam or whatever in a golem or automaton. I still allow crits and sneak attack for undead because in my experience almost half of the enemies you face in D&D are undead, and the 3.5 Rogue's inability to sneak attack undead, elementals, constructs, oozes, plants, and maybe one or two types I'm forgetting made the class essentially worthless in sometimes quite literally every other combat, but by far the biggest source of the problem was the undead.
But undead are really the only place there's a tension of any kind between my personal sense of "okay, that makes sense to me" and "this is how the game needs to be balanced". And I defer to the latter. I might amend my house rules so that INCORPOREAL undead are immune to sneak attack. While that's a bit fiddly, there is something very weird about the idea of backstabbing a wraith.