Deus Ex. When I first played it I was amazed by the graphics and I specifically remember being impressed that your character was reflected in mirrors. I’ve been replaying it recently and the graphics are obviously very dated, but it also doesn’t run smoothly on modern hardware. My PC gets louder and louder as I play it and eventually the game starts to stutter and I have to restart it.
I think they’ll go full terminal mode on the next iteration. You’ll download a 100MB launcher and then just do cloud gaming from there.