You must have missed alot in your play:
You can sneak behind enemies and backstab - it is one of the most satisfying experiences.
What do you mean I missed it? I specifically mentioned it. You can backstab - which has nothing to do with sneaking. You just need to stand in a specific place - which can be somewhat annoying with the awkward camera angles.
That said, I'm aware that you can "walk" and try not to alert enemies - but AFAIK, there's no actual stealth or assassin abilities.
There are many different types of bows and crossbows (and arrows and bolts) that can be upgraded and infused, and the game and world design provide significant freedom and opportunity for their effectives use.
Sure, but the actual mechanics are simplistic. It doesn't feel dynamic or well implemented, like it does in Skyrim. It's not bad as such, it's just nothing special - and I like my archery.
It feels slow and awkward - and the whole aiming/locking thing is clunky given the constant danger of dying. I feel like I'm figthing the UI/camera when using archery - which is why I don't enjoy it.
In Skyrim, I feel like a bad-ass archer, which is exactly what I want from that kind of experience.
There are also many schools of magic in Dark Souls (1/2), and in fact magic might be overpowered in Dark Souls 2.
Well, there aren't many schools - but there are a bunch of spells. I guess I just never found them too interesting.
Again, in my opinion - the attribute driven system makes every character feel similar. As in, you don't really feel like a Wizard just because you wield spells, as anyone can do it. There are no magical perks/traits/feats - just a couple of attributes for mana or whatever. Dull.
I like games that allow me to create distinct characters with unique powers that aren't available to others, and I love non-combat abilities. Stuff like sneaking, lockpicking, pickpocketing, bartering, charming and so on.
Skyrim uses an open system as well, but the Perks can make your character feel much more distinct.
Dark Souls is about combat combat combat - and that's fine, but not really my kind of RPG. You don't enter a new area thinking about how much stuff there is to find and read - or how you're going to explore every nook and cranny before moving on. You enter an area looking for your next fight, and then you find a potion glowing somewhere - or one of the few unique items lying around. That doesn't feel much like exploration to me.
Well, it could be a good experience - but then it'd need to have proper cooperative multiplayer like Diablo. I don't like the odd and clunky way you team up in the Souls games.
I think it would be really cool as a straight-up cooperative action RPG, though the itemization seems relatively barebones to me. The whole crafting with +1 +2 +3 stuff is boring and predictable. I know there are unique weapons - but the overall arsenal comes off as a joke compared to the best loot games.
Playing a combat simulator with barebones story and sparsely detailed "grim" environments, alone, just doesn't do it for me. I know some people are fascinated by large and mostly empty open areas with beautiful vistas, but I like a lot of stuff to find, read and investigate.
Such is how we all differ.
To me, the Souls games have barely evolved since Demon's Souls - and it's just the same game over and over. I'm not seeing much in the way of evolution - very unlike Morrowind -> Oblivion -> Skyrim.
Once they start adding something significant - I'll check into them again.