I don't think it is that strange and I would be wondering the same thing if I was in his position. Maybe it does not happen in the US like in the rest of the world but contracts are not that solid, they have ambiguities and wording that the employer uses to their advantage, with the worse operators they plainly ignore items and change things at their whim. There are companies out there that promise everything but in the end deliver very little. I think if the contract you sign pans out exactly as stated then yes you should stick with it for the agreed period. I know one of the main worries is cultural and not getting along with the other crew members and that will not be mentioned in the contract. As an FO on a 744 you can expect the crew already employed to be professional, if they are not then I think that is grounds enough to pack it in and get out without any moral concerns about breaking the bond.
I would be wondering the exact same thing, if it is as !!!!ty as it could be can I get out without any problems before the 5 or whatever years as to be honest life is to short. Without problems is not being followed back home with this crap.