haha, i did that too! xD
and don't forget about first obtaining every password/keycard, and then hacking everything anyway because bonus xp! :I
i suppose you're right. it's been a while since i played it and it felt rather open to me, but thinking back now there actually weren't all that many open areas.Still it's not an open world game. It's perfectly linear first person/stealth game hybrid with some RPG elements.
that sounds interesting!