Crysis 2 is not a continuation of the first Crysis. In the first Crysis, when the aliens expanded they had froze everything. In Crysis 2, these aliens and this concept no longer exists. Crysis 2 is more a Killzone killer. Replace helgasts by aliens, bots aliens by heavy Helgast soldiers, alien ships by ships Helgast and you will have Killzone 4 or whatever...
Where is the consistency with Crysis 1?