you mean the ovas, the series is bad, the ovas are epic. higurashi and elfen lied are also in my top 10 so i think you would love claymore as well. the claymore series has a bad end since it just kinda stops, where the manga keeps going. read the manga at one manga or download it and use cdisplayex to read it.
if you have seen claymore, then try the hellsing ovas