Funny, I started playing Alpha Protocol this weekend too, because it was -20 degrees outside and I didn't want to go anywhere.
Yes, very stable, but also clunky. I can't put my finger to it, but the entire game feels slightly.. off. From the menus, to the camera controls, to the shooting mechanics, to the character customization.
I am still enjoying it a bit (only did 1.5 missions so far), but I am wondering about a lot of the design decisions that went into this game. Who thought having bouncing bright yellow markers over everything was a good idea? I mean, I can go into a mission and know I'm supposed to fund it myself. But I don't have to! Because the "terrorists" have been kind enough to mark all their valuables with bouncing yellow money markers that are impossible to miss!
Also, instead of having a working physics system (so I can just run off a ledge and fall down), I instead have a bouncing yellow arrow showing me "HERE YOU MAY FALL DOWN". Why?? And who in their right mind would not know that ladders can be climbed without having to have a bouncing yellow marker telling them so? Puzzling. It's like the developers assumed all their players are complete idiots who needs visual markers to be able to go from point A to point B.
I have not yet experienced the fabled choices and consequences, but I do like the dialogue. And I like that my Thorton looks like a cross between an emo kid and a surfer dude. I hate him so much!!