Liev Schreiber as John Clark. No no, HELL NO. He has the vaguely 'slavic' look I've always pictured for John Clark, who's described (in part) as a man who looks like the typical Russian, particularly in the eyes. But Schreiber didn't come across as Snake, as a veteran spec-ops operator. I'll give Schreiber a little credit, he had parts of the role down; but he sure as hell didn't eminate DANGEROUS! as the books describe. I just flat out didn't buy him as Clark. The key scene that sums up my disappointment with him was the raid to the Russian bomb lab, where he's surprised by the two Ukraine soldiers and is trying to reason with them. Clark never begged, Clark never sounded hysterical or unsure. Clark was always sure, always in the know, always ready. Sorry Liev, but just didn't buy you as Clark.
I always find it interesting the different ways people view the scenes. Although I agree that Liev didn't really have the "book look" of John Clark, I didn't have a HUGE problem with that side of it. But the specific scene you mentioned I saw as him playing super-cool and level headed. He's putting on his "fear-face", while dazzling the guards eyes with his flashlight to the point he can pull out his gun and suprise the 2 guys who have an obvious tactical advantage.
I got that impression from some of the other books of course, a good scenrio is the beginning of Rainbow Six and the how Clark manages to get out of the situation he's in with the hijackers, he pretends to be a little afraid to get the bad guy to let his guard down, then pounces.
But that's just the way I saw it.
Andrew