Have you played lately, Kafein? The 1h stab is as easy to pull off as the 2h one, not as lolstabby but still a 90% hit.
I've played during the short time it was actually where it should be. Tydeus nerfed it again afterwards and now I pretty much do not use the stab unless ironically. True, for the longest of times, before the patch that made it right, it was absolute shit. But now it's just kind of meh. Stabbing armors correctly still stuns you randomly because the gods of RNG and latency said so. When you run around in a "one-swing me please" suit this kind of thing breaks the deal. Even in the best situation, you have to be extremely careful not to hit at maximum range and not too early either, which is a difficult thing to do when your stab animation covers much less ground while remaining in its sweetspot than with other weapon types. In this respect the 2h stab is still on a completely other planet in terms of usability. With my longsword (and any 2h sword I happen to pick up) I can gleefully stab away before reaching a point at which the opponent is actually inside my reach, hit with the tip of my sword with zero momentum and still do maximum damage. I can also do a facehugverticalteethweaselstab with ease because the weapon is so high up already.
Sure, some of my grief comes from the fact that I die quickly and even a slight unreliability is unacceptable in that context. Some of it also comes from the fact that I have
only 6PS and 184 wpf, which should be pretty damn powerful enough still. But in the end I tend to perform better with a cleaver, scimitar, mace or even a frigging axe than with a KAS trying to stab things, whereas it was the other way around when the stabs were good.
Don't get me wrong, I think the balance of stabs with respect to other attack directions is better now than it was before (talking about an average of all the weapon types), I just wish someone would buff swings instead of nerfing stabs. The latest stab nerf was indiscriminate with respect to the specificities of the 1h stab, leaving it half-broken.