The lack of save game option ruins it.
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But this ps2 version is terrible - would it have killed the devs to add a normal save game option? In the ps2 version of DEUS freaking EX you can save at ANY place ANY time, and Deus Ex is a technically MUCH more complex game than this.
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But just because you can't save during missions you will have to replay them over and over for literally tens of times because there's a lot of trial and error in this game, and a lot of patience is needed too.
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So playing this ps2 version = wasting your precious time. But who am I kidding - I must be the only person on the whole planet trying to play this in 2013 anyway.