I'm pretty sure I saw everything there was to see, especially with granny rags. So unless it was one of those heart-clues that I missed, or something you find out if you don't murder her in the sewers? I don't know where that information could've come from. :S
The game itself was pretty fun. I'm not sure if I like the way that it gives you all these various tools and methods of murder, but then heavily encourages you not to use them. On one hand I kinda like when games do that, and encourage you to intentionally limit yourself... On the other hand I felt like a lot of the upgrades and things I had were completely gone to waste. I'd pretty much stopped upgrading anything by the time I was on the bridge I think, because it was all pistol upgrades, or grenade capacity, or other things I didn't use because my primary method of interaction was holding CTRL to choke hold dudes. Some non-lethal upgrades would've been great. Sleep-bolt carry capacity was one that stands out. Some sort of smoke-bomb, or flash bang, or knockout gas, etc also would've been nice.
Also the whole self-limiting thing was kinda ruined by the fact that the game straight up tells you "don't kill people if you want the good ending!" I would've preferred it to be left ambiguous, rather than plainly laid out there. It kind of hangs over your head the whole game that you shouldn't be murdering anyone because you wont get a good ending. A much better way to do it would've been to portray the rank and file guardsmen and overseers and the like as just regular guys doing a job (which it kind of did, but the effect was ruined by the word-of-god "dont murder them" order). Encourage me through gameplay to act a certain way, don't just straight out tell me in a loading screen.
The plot was pretty ho-hum. Though it does get points for tackling some pretty dark themes and not beingway over the top about them. Most of this was contained solely within the books and notes you find, but it helped make the world a bit more engaging, and some of the stuff especially made that girl who's name I can't remember plight a bit more urgent. I also like the way the whole Corvo/Empress/girl-with-the-name relationship was done. Lots of implication, but it never felt the need to straight up say one way or the other. Some of your targets rationale for why they did the things they did were pretty well done too for a video game.
The setting was good, if a little over-developed. I imagine a possible sequel is the reason why so much time was spent on things that have absolutely no role in the game whatsoever (whales, I'm looking at you)
The basic mechanics of the game though, are kinda mediocre. Especially for a stealth game. So many times during the game I was expecting to be able to do something, only to find out that it's impossible. In later levels there are heavy curtains all over the place, perfect for hiding in or stashing bodies, only you can't interact with them to close them. There's constant spotlights over areas you need to move through with no way to turn them off or destroy them. Everything the game does right is overshadowed by the terrible terrible AI, always hard to get right in a stealth game, but it's like they didn't even try. It's absolutely no fun sneaking along rafters and dropping down to grab enemies and drag them into the shadows only to realise their friend was about 5 feet away, looking right at you the whole time, but too stupid to do anything. By the end of the game I was so familiar with the shortcomings of the AI that getting no-kill no-detection was trifling.
So, lots of spoilers here, read at your own risk.
Another thing is granny rags. Who else ended up killing her? Rather interesting. The quest she gives in the beginning where you have to put the plague rat guts into the distillery to infect them all; I actually got to the distillery with the guts, then ended up not doing it when I saw the ledger of who was going to get elixer. Family X, family Y, that sort of thing. For whoever DID do it, does it effect what quests you can get later on? I did all the slackjaw quests and I was wondering if those would be available if I went through with it.
It makes no difference, I poisoned the suppliy, and the next mission Slackjaw invites me into his base to offer me a job anyway. Even though I didn't kill any of his thugs and at least 2 of them saw me.