1. Agreed. In fact, I felt like most of the characters and factions in the game were underdeveloped. I didn't feel any connection to them, no real reason why Adam would take their side and care about them and their ideals. But the worst offender is IMO Dr. Reed. She's essentially Adam's entire motivation but she only shows up for maybe ten minutes in the entire game. You eventually find her near the end of the game, she gets 10 lines of dialogue and disappears again, only to provide an ass-pull reveal in the post-credits cutscene. This is supposed to be the woman Adam loves, even if they aren't together anymore. Prove it me somehow. But don't tell me, show me. Make me care. The Darkness, for all the flaws it had, did this brilliantly just by having you sit on the couch with Jenny and watch tv. A simple moment, but it worked wonders.
2. Yeah, I really missed my ludicrously sharp and powerful energy sword. I'm serious by the way, I loved slicing enemies with the Dragon's Tooth, despite it being game-breakingly overpowered.
3. Once again, no argument here.
4. Yathzee, you spoony bastard. Quit making me agree with you, it's getting tiresome.
5. NOW EVRYWON VILL SEE WHY I NEED A SKULL-GUN!
Despite it's flaws, Human Revolution also does a lot of things right, like the stealth, the consersations/negotiations and the hacking. I also like how HR looks. I've always felt Deus Ex was visually kinda bland and uninspired, even with the limited graphics technology of the time. Deus Ex is cyberpunk and Human Revolution actually looks the part: the design of the technology and environments, the moody yellow and black color scheme, etc. It does help that it reminds me of Bladerunner Ghost In The Shell, both of which I absolutely adore.