I have played the HR leak and I do think it will be good. That doesn't mean I can't complain about the bad decisions and poor justifications Eidos is making. People always take a binary attitude to these things, like I either need to think HR is the best game ever made, or the worst. I think neither.
Firstly, in a story there needs to be a confrontation phase (have you never read a book?) that should never be OPTIONAL
I've actually read many books in which nobody died. Haven't you? There can still be conflict without actually killing anyone. And besides, even if you privilege the story over gameplay, there's no reason why you should have to engage in balls-to-the-wall combat in a Deus Ex game which is supposed to be all about playing how you want. You only need to look to the original game. You needed to kill Anna, for example. But players with an exploratory mind were rewarded with an alternative method: a kill phrase. Eidos only needed to think outside the box instead of forcing us into cliched BOSS BATTLES in which you comicly throw explosive barrels to kill them (at least the first one).
Second, he is talking about shadow systems, that means to spread shadows throughout levels so that players can sneak around even when realistically there'd be no shadows at all, this is unrealistic.
Oh look the realism argument. You must have missed my point: I don't care about realism. I care about gameplay. If HR had a light-based stealth system the gameplay possibilities would be increased. And a Deus Ex game should always, always be about gameplay possibilities. Imagine hacking into a computer system in order to turn off a facility's lights, which kicks in some sparse backup lights and also creates shadows for you to hide in. (And if you're going to give me the LED argument again, see above.)
Here's the thing: a light-based stealth system is ALSO a line of sight stealth system most of the time. You can still hide behind things just as effectively as you can in a line of sight only system. But you have the added complexity (and resultant possibilities) of playing with light sources. This was, of course, a key element in the Thief games, the best stealth series yet made.
HR's line of sight stealth merely removes options. It adds nothing. That's why it's inferior.
Let me repeat: I think HR will be well received. I think it'll be pretty good. I also think it'll be inferior to the original.
Here's the thing: the good stuff about HR Eidos owes to Ion Storm. They are the things they have emulated pretty well. The 'additions' and changes Eidos has made are almost uniformly bad. That doesn't mean the whole game will be bad. Just disappointing in a few ways.