So I've been playing Deus Ex recently, and it saddens me to think there haven't been many games quite like this since it was released. If there is any game that can be called a true RPG, it's Deus Ex; it isn't "lol do whatever the fuck you want," but it isn't "lol railroading" either. The choice and consequence is heavily apparent, and the amount of player innovation is there, too (The game doesn't tell you to "do exactly as I say," nor does the game tell you to "do whatever you want;" it presents problems that need to be solved and goals that need to be achieved and allows the player the solve them in a way that he or she sees fit. On this playthrough, I haven't killed a single enemy yet, for example). It's true role-playing at its finest, and that's without mentioning that it has one of the most layered, complex and generally smart plots in video game history.
I can only hope Human Revolution is half as good as the original is.