I'm glad you mentioned the mods, because I fell in love with Deus Ex: Human Revolution, and then went and bought the earlier games on steam in a package deal.
I actually like the pacing a bit better in the original Deus Ex, but there were a lot of mechanics that didn't age very well. Also, Dues Ex is a game that reminisces arcaic computer games, in that it suffers from a serious lack of direction, by that I mean I can't touch Deus Ex without a game guide. There's almost no clues on where to go, and all the maps kind of meld together as far as color scheme goes. It's very, very easy to miss things. To me, the stealth mechanics didn't age very well, so I followed the build to simply kill all things with guns. Sniping did age pretty well, but that's because you have no distinction between head shots or body shots. Sniper is pretty much a one hit kill if you spec in it and get a solid shot on the target. Though sniper rifle does run out of ammo fast.
I really, really like the original game overall, and I love DX:HR, though I could write a book that's already been written by the gamer community on all the bad decisions that went into DX:HR. They fucked up royally on the bosses, and fucked up even harder on the ending. The game really does haven't an end. The story has absolutely no closure. The "ending" is just the head developer being in love with the theme of the game. I say this because if you follow that guy on facebook and twitter, he does act like an augmentation fanboy. I found it slightly ironic because the original game is less about the augmentation itself, and more about how far technology itself can be pushed (idolized in Bob Page's deep desire to trascend humanity itself.) The end goal in Dues Ex is to leave humanity behind in an attempt at becoming a god in a world solely couched in technology. in DX:HR they're more obsessed with replacing body parts than anything else.
Sarif's definition of "human" is INSANELY SHALLOW. That was actually my biggest grip with the whole game. Physical size and strength alone apparently determined to Sarif what it meant to be human. Think about it, you only really fight other major Mech Augs in the boss fights. Everyone else seems to have an aug here and there, AND THEY KILL YOU. Jensen can't survive a fire fight. I could never last very long if I got into a gun fight with groups of non-mech augs. They'd murder Jensen in a heart beat. It made me want to slap Sarif and say "SO MUCH FOR THAT >:/ I'M PRETTY HUMAN. BULLETS STILL KILL AND I CAN'T DO ANYTHING SUPER-HUMANLY COOL WITHOUT CANDY BARS." And you know what? Jensen's life was by no means extended by the addition of the mech augs. So the more Sarif tried to convince Jensen that he was "more than human" I really just wanted him to shut the shit up, because that was such a narrow-minded definition of the human condition. A walking tank doesn't transcend the human condition. It would be like saying Iron Man had departed the means of being human every time he put his suit on.
What about someone who IS IN a tank? Do they transcend humanity? Or do they not simply because it isn't attached to their body parts? >:/ I don't like the idea of Sarif being an idiot because I like him, but this was a criticism I could never get over in DX:HR.
At least to Bob Page in the original Deus Ex, he had a more expansive definition for what it meant to be human. And that got down to the grit of the human condition. Short lives. Humanity's tendency to destroy its environment, and its cruelty to each other and to other living things. Instead of fighting humanity's condition, he indulged in his greed to transcend for all the reasons he had, at whatever the cost. I could relate that to Doaist theory if I wanted to. It's deep shit. And with a story like this, if you don't cut deep you're...well...DX:HR I guess.
my assumption is that DX:HR suffered from their Director. He's obsessed with mechanical body parts, and very much so into himself, and I think that reflected in the game's finished product. Even the writer said they really didn't do enough game testing. And since DX:HR the director has been making bad decision after bad decision regarding what happened with Dues Ex: The Fall. It never should have released on the phone, that was just a bad idea. Their audience is on computer or consoles <__<;;