Playing the game now, although not very far in. Prague's pretty great, although it can be a little hard to navigate as there's not much visual distinction between the areas of the city I've visited so far. Still, as mentioned, there's loads to explore and a lot of freedom to do so: I've just raided the bank, even though the last story event I completed was visiting TF29 for the first time.
A shame the PC version is so buggy: I can't reassign the iron sights keymap without it disabling my ability to fire weapons down sights (extremely annoying, as I like much prefer having iron sights assigned to Q rather than RMB - please let me know if anyone has experienced and solved this issue), weapons sometimes just start firing unstoppably after being unholstered unless unequipped, there are quite a few little visual glitches (missing objects, etc) and poor optimisations, but as a game, it's more of the same from Human Revolution, which was my favourite game of that year, so a very good thing. Whereas HR PC felt like an equal to its console bretheren, MD unfortunately gives the impression of being an afterthought.