This is a pretty fuckin awesome Z-budget film. If you think this is a bad zombie movie, you ain't seen bad zombie movies.
Would it be nice if there was better acting? Yeah, sure - that's always the answer for most movies though. How does this bad acting compare to typical zombie movie bad acting? It's a good 40% better than typical crap Z-movie acting, as in the acting is actually tolerable.
How about the visuals? The crew hasn't got millions, and I don't actually know how much they had to work with - but the effects in this are damn cool. I like the old fashioned use of production effects, and a lot of the makeup/fx is pretty damn awesome, definitely in the higher end of Z-movies.
Could the script be better and carry a bit more continuity? Almost always, but in this case, I'm too tickled by the parasite alien babies growing in zombies' scrotums and the end "solution" to the zombie plague. It's a funny and interesting Z-movie, and actually enjoyable.