Crysis: Warhead I can connect to the positive overall impression me only. It offers improved graphics, smarter enemies, and a comprehensive gaming experience. For 5+ hours SpielSpass the favorable price is reasonable. Of course, additional patches to Crysis and integration would have been useful to the "basic game", but I also understand Crytek's frustration over lost revenue.
Conclusion:
I'll first do not buy, because the electronic security measures on the part of EA punish honest buyers and certainly not lead to a real improvement of software piracy. Look times with Stardock to how to do it better ...