While reading some of the reviews on here my expectations sank but I thought what the heck, I'll watch it anyway. I was expecting really shockingly bad animation but was pleasantly surprised because when I did watch it I thought the animation was okay. Not of high standards but I've seen worse. I think the lowish quality of it is akin to the original. The original didn't look that great, was low budget but it turned out to be an iconic classic because of the direction and story telling. Seems fitting to me it doesn't look high quality (feel free to down vote me :).
I thought the voice acting was fine. The film is faithful to the original but there are quite a few small differences. An example of one is when Ben explains how he got from town to the house and we see a flashback. I thought that was cool. Some nice animated gore scenes to boot makes this for me a good zombie movie and a compliment to the original.
I'm not sure how strong it will hold up on its own but maybe if it comes released on a bonus disc with the original it would be something definitely worth buying. Another reviewer said he hoped they would animate Dawn Of The Dead. I'd be up for that.