Never played Tex Murphy, but I've always thought of sticking 'live' actors in a digital world corny and hokey. It just looks......wrong. It pulls me out of my suspension of disbelief, as either the actor must become a 3D characer in that world or the world itself must change into a 'live' world. The severity is jarring.
When I saw Atrus (forget, was that him?) at the end of realMyst, the first thing I wanted to do was walk around him and check him out as a 3D live character. Turns out he was a dumb flat FMV image. But the worst thing was that I WAS NOT ALLOWED TO MOVE around the room. It was supremely stupid and the whole thing was cheapened.