In what ways is Invisible War truer to the original Deus Ex over Human Revolution? Arguably the only real flaws in HR are the boss encounters simply because they do not have the flexibility of how you can approach them but that was partially remedied in the Directors Cut.
IW is a deeply flawed game, about the only thing it has over its predecessor is it looks a bit prettier, that's about it. Everything else in IW was compromised both by design, meant to appeal to a broader audience by simplifying many aspects, and the hardware limitations of the original Xbox.