Is it essential to play Crysis Warhead in order to appreciate the complete video game experience?
Crysis Warhead isn't a multiplayer part. It's a totally single-player video game actually, informing the tale from the point of view of Psycho, with in my modest point of view much better gameplay than the initial.
You're speaking about Crysis Wars, which is a different video game packed with Warhead, as its multiplayer part. This remains in comparison with Crysis where the multiplayer was incorporated.
I would certainly claim obtaining Warhead is most definitely worth it to include in the tale and also have a multiplayer video game.