Pros:

-Addicting
-Minimal glitches
-Challenging gameplay
-Outstanding scenery
-Cool storyline
-Appropriate dialogue
-Ghosts!

Cons:

-Too freakin' dark to see most of it
-Not enough ghosts!

Conclusion:

I downloaded, I played, I HHHNNNGGG!!! 'd. At the end of the day it came down to only two real cons: it was way too freakin' dark most of the time which was a serious pain in the ass and there WAS NOT ENOUGH AWESOME GHOST ACTION! That's about all the cons I could think of, really.

As for the pros, it was a cool, addicting campaign with a seriously challenging (but playable) zombie population that just kept comin' and comin'. The levels are the perfect length and the scenery was fantastic. So far, I haven't found any real glitches in it so kudos on that one. One thing that I thought was pretty cool was when you see the first ghost, the dialogue of the characters say something like "Great. Zombies weren't enough, now we got ghosts." or somethin' like that. Very awesome.

My suggestion would be to brighten up the levels enough to see the environment and to add more, scarier ghosts! Seriously, the ghost thing was pretty imaginative... I didn't see it coming at first... or second... or third...

Conclusion? 9/10 for lack of the darkness thing...