1. This game is essentially free advertising for Greek tourism. To make such a big deal over this and hold these guys for so long means that companies that make these kinds of games will go elsewhere.
2. The way Greece handled this event is awful PR for tourism in general. Taking pictures from a public road gets you 3 months in the can? I can't think of a better way to discourage people from booking flights to your country. Oh, wait, that's right, the Greek economy is booming so they don't even need tourist dollars. IF these guys did in fact break any laws, they should have been a day or two in jail while the diplomatic legalities were worked out and released on bail. This is a travesty.
3. What the hell is Greece so scared of? They're part of NATO and have about as much chance of being invaded as Canada.