Although I don't think the Mantic Elves are very good, the skeletons and zombies are very good and I think actually a bit better in terms of their proportions. Especially in the quantity zombie are usually present on the tabletop small differences don't matter that much. Although I agree if you don't like the style of something at all the price won't be an issue.
Here are some comparison pics Mantic vs.
GW
From this forum, a post by Osymandias
Mantic on the left,
GW on the right.
I already have a
VC army but if I was starting a new one, at half the price and comparable style and quality there is no question which ones I would buy.