Lex is supposed to be a dominating business tycon not fukkin Mark Zuckerberg
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while true, you're talking about the established character, ignoring he had to grow to get there....
as for this casting: I was one of the most highly critical people of this casting, see my posts in this thread.....after seeing the movie, i can say he did a good job...his lex wasnt the established character we know, it was more the lex before that....you could see glimpses of the established lex's traits, but you could also see he wasn't fully there yet.....he really did a good job....