The Witcher qualifies as an RPG - at least in the traditional sense which I outlined in my previous post - because even though you only control Geralt, you can upgrade his stats using attributes descended from traditional tabletop games. There's stuff like STR, DEX, INT, WIS, CHA in there and you can use those aspects to dramatically shift his character and skillset in ways similar to playing a fighter/wizard/rogue in D&D for instance.
Detroit, to the best of my knowledge, has none of these stats. You're mainly reacting to points in the story. So I'd say it qualifies as an adventure game, but not really an RPG one. Once again, I just go by the strict definition where a video game RPG just has to have substantial tabletop attributes to them, and the easiest way to determine if that exists or not is to see if there's character progression, stat enhancement and an emphasis on plot advancement. Detroit has some of those, but not all. Twenty years ago, Detroit would have been made as a point 'n click adventure game, like King's Quest or Gabriel Knight. There's a reason those games were strictly considered to be adventures, as opposed to RPGs - which at that time would have been a genre used to denote stuff like Betrayal at Krondor.
I don't know anything about Alpha Protocol, so can't comment there.
