I would stick to 1, though. 2 and 3 become the old linear CoD experience, there are the suit powers and all that, but all maps are just long corridors.
Far Cry 3 gives almost the same freedom as Crysis 1, without the Nanosuit stuff though.
Well I also got Crysis 2 a long time ago, probably will check it out anyways.
It's a shame most games become long corridors nowadays, but also kind of understanding. Development just became insanely expensive and having to advertise your game you can't really risk wasting 300.000 bucks on a game element because most players just walked past it.