Where does it fall in which respect? Difficulty? Quality?

Difficulty it sits around the DeS, Das1 point. Much harder than DaS2 and BB though.

Quality wise it just looks like Bloodborne but you're using a Dark Souls character instead and it has all the juicy stats from a Souls game. I haven't found many weapons though. One sword, one axe, one stave, one great sword. I prefer it that way (BB style) instead of having 15 longswords that all do exactly the same thing with minor stat changes.

I don't know about the chalice dungeons or less content (though judging by Versus_Evil's reply saying he's played 176 hours so far, I would say "less content" is potentially incorrect). but the setting, art style and graphics in general are breathtaking! 

Chalice dungeons in Bloodborne are randomly generated dungeons. Each time you warp to a dungeon it will be different than last time. In theory the content is infinite because of that. However, I got bored rather quickly with the dungeons, because all of them are repetitive in nature and style. Nothing like traversing the world and discovering its wonders like in both Dark Souls and Bloodbore's main quest.

TOP 3 of this 5 games:
1. Bloodborne
2. Dark Souls 3
3. Demon Souls

So, I've just beaten the game. 27 total hours, standard ending (there's apparently four).

It's a beautifully flawed gem of a game. It's the shortest Soul to game, though I don't agree with the notion that it is the easiest (that'd be Dark Souls 2, or Bloodborne if we count it as a Souls); it certainly has its challenging spikes here and there.

A small mini-review:

+ Oppresive but alluring atmosphere and world to explore.

+ Gameplay is what you'd expect, but more ruthless, relentless and challenging.

+ Some classic Souls dungeon design that gets burned into your mind as your progress.

+ There are (albeit few) truly memorable bosses, worth of being on top of every other boss in the franchise.

+ Fair, except for some sequences here and there which are incredibly cheap and injust.

+ The OST is fucking incredible and I'm glad to have it on disc. It's beautiful.

+ Tons of side-quests. They're hard as nails to complete, so you have to be careful.

+ Borrows from Demon's, Dark Souls 1 and 2, and Bloodborne.

- Borrows waaaaay too much from Demon's Souls. Now before you might say "how this is bad?", it felt like going the cheap way simply replicating sequences from the former game. There are entire places that made me think "been there done this", and things play out exactly as in Demon's.

- Shortest Soul to date. That being said, I failed most of the sidequests, and missed certain objects and items.

- Barely any secret area to explore (Secret as in Ash Lake/Cainhurst Castle kind of secret).

- Some obscure things to do that are clearly meant to sell guides, particulary for those like me who play offline. No, seriously, there are some dumb things you have to do to at times.

- Some weapons/armors are worthless. I know this is the case with almost every game aside from Bloodborne, but unless you want to give your character a cosmetic appeal sacrificing defense, there are some items that I have trouble believing people would use.

- The ending (at least the standard one) is a piece of crap considering this is supposed to be the final game of the franchise. Credits Song make up for this, though.

EDIT: My Dark Souls 3 rating is unchanged:

· Dark Souls

· Demon's Souls

· Dark Souls 3

· Bloodborne

· Dark Souls 2

SECOND EDIT:

I forgot to mention how lazy the blood splash effect looks in this game. Especially considering how beautiful was it to have your character drenched in blood in Bloodborne. It's terrible, guys. All kind of terrible. At first I thought my game was messed up or something but no. The blood splash effect is so bad it's worth mentioning here.

Agree with this, except I think Dark Souls 2 and Bloodborne are easier.

+ My 2h style is viable and fun, but still challenging

+Places are great, world is big

- Sometimes the bonfire distance is like 10 steps away sometimes 1000 steps away

-Estus charges stacked quite quickly for me

How are the side quests done?

Bloodborne
Dark Souls 3
Dark Souls 1
Dark Souls 2
Demon's Souls

I don't agree with this one. There are quite a few optional areas: Smouldering Lake, Archdragon Peak, Consumed Kings Garden, and Untended Graves.

Not unlike any other Soul, on which you interact with an NPC under certain circumstances, then you have to interact with him or her again on another place enduring a different circumstance. I was tasked, for example, to find the missing partner of a knight, but I was never able to track him down, thus failing the sidequest altogether.

I've just recently found the first one, so I kinda regret that comment now; that being said, the thing I had to do to enter it was something I think I'd never had found by myself had not another user told me about it. The only one I found by myself (so far) was the last one you mentioned it, and that's basically a Firelink Shrine reskin. I'm not even counting Consumed King Garden because it doesn't really feel like a sideplace of the magnitude of a secret area (heck, the game doesn't even award you a trophy because it probably didn't consider it secret enough), and the only thing it takes you to is to Untended Graves, so...

Maybe I'm being a bit harsh here, but that's how I feel. No clue about Archdragon Peak though.