Grave of Fireflies is a great movie.. There are lots of good anime OVAs and series out there, just as there are lots of bad ones.. just like any form of media..
Dont dismiss the whole genre because you got caught up in a bad series.. Hell.. i usually stick with at least 3 eps of a series i dont like to see if it gets better.
Spinach , i have WHR, and it's ok..
If you have seen Noir, or Hellsing, or E's otherwise.. it's kinda like that..
It's hard for me to sum it up, so i'll find you a synopsis.
http://www.animeacademy.com/library/whr/whr.html
that is generally a excellent site to see opinions on various anime series/ OVA's..