I put a few hours into this. I'm barely out of the tutorial, so these are very early impressions.
I liked Human Revolution quite a bit when judged as stand-alone game, and it only would've required a few changes to greatly improve on that base. Sadly, most of its shortcomings seem to be present in MD as well: no leaning or full first-person mode, still the same takedown system, still that completely broken XP system, still cutscenes that take control away from you for no real reason. Not that it's surprising, but after establishing a fresh fan base with HR they really could've taken a couple of steps towards Deus Ex as they're still using the name after all. The whole prologue also seemed pretty convoluted, as if they had three or four different ideas on how to start the game and in the end decided to implement them all. At least the actual tutorial level was fairly decent and non-intrusive.
It's probably way too early to judge the level design, but it seems like they've learned some new tricks. The vents are still there, but the layouts already seem more complex and varying than in HR. Hopefully it remains that way.
The writing kind of sucks. I don't think HR was nearly this bad, but I might be wrong. The whole "Augs Lives Matter" thing is really dumb, of course, but it wouldn't be as grating if the conflict wasn't so hamfistedly portrayed. There's little subtlety to be found. They actually use the word "racism" in-game to describe the conflict, and once you get to Prague the game starts relentlessly bombarding you with this stuff in every way it can, in the least creative ways possible. There are neighborhood watches armed with assault rifles protecting people from "augmented crazies". There are aug ghettos. There's a plan to build a city in the middle of a desert "by augs, for augs". People can't put together two sentences without including "aug incident" there somewhere. It's not just this particular aspect of world-building either — Eliza Cassan interviews a guy who says he's running a non-violent organization, cuts him off mid-sentence, shows an unflattering picture of the man and then asks "is this the face of a pacifist?" before making way for an advertisement about how objective and neutral a news network Picus actually is. Did a 16-year-old write this? It's about as subtle as the radio shows in GTA or something, except without a hint of humour. How hard is it to write a news report that resembles a news report? All of the characters I've met so far have come off as utterly forgettable one-dimensional archetypes, but then again, HR wasn't all that different in this regard.
Before starting the game I disabled all of the on-screen clutter like the radar, the objective markers, the button prompts and the object highlighting along with everything that has something to do with the cover system which I'm not going to touch with a ten-foot pole. It's too bad that I had to enable the button prompts after about two minutes because I had no clue what I could actually do in the game. Without them there's just no way to tell which objects can be interacted with, as I don't want half the game world to be permanently lit up light a Christmas tree. Even with the prompts I find myself constantly running into every object in the game world just to see if I can do something with it. Did HR have this much clutter in it? It had some for sure, but I still played it without the object highlighting just fine. I'm guessing this "problem" will go away once I've clocked a few more hours into the game and learned to tell which objects are just fluff and which aren't, but it still kind of blows.
It's also rather annoying that all the background conversations are so quiet that it's hard to tell what anyone's saying, and there are not subtitles for that stuff. Then again, at this point I'm not sure if anyone has anything interesting to say.
From what I've understood, you spend most of the game in Prague, and I'm perfectly fine with that. The game doesn't have to be a globetrotting agent adventure, and a small-scale plot is something that I'd actually prefer instead of lame Deus Ex fan fiction written by people who don't really want to write a Deus Ex game. I'm just hoping that the first few hours aren't indicative of the quality of the rest of the game in terms of the writing...