I know this will spark debate as it just won SPIKE GOTY honors, but I mean no disrespect.
This price alone makes this a definite BUY, but allow me to explain:
The concept of choosing your fate is exactly what every zombie based title should have, as any survival situation would vary. They near perfected this, and even went so far to compare your choices to other gamers. This leaves you wondering where you went wrong/right and how this will affect the future.
Again, this concept was awesome and truly invested the gamer in the story to it's roots, but this is where it stops.
Granted the graphics were meant to mimic the comic book series, but even with this aside they are mediocre and the character animations are forced. This can be very distracting from the game.
The fluidity of the story (on PS3 at least) is often interrupted due to excessive lag and breaks while the game is continuously loading and checking what decision was made to result in the next event.
Overall you can't argue with GOTY and this is certainly worth a BUY with the price in mind, but there is a lot of work to do if the next game from this developer will succeed.