Because of people like you giving one star reviews to something JUST BECAUSE IT HASN'T BEEN ISSUED on DVD, when it finally appeared on DVd, stupid one star ratings that don't relate to the actual product/series itself have reduced the overall rating of the DVD to 2 and a half stars. Not an accurate reflection of the actual content of the series at all.
Outstanding work, you 'one-star-because-it-hasn't-been-released
Seriously, some of you people need to belt up and grow up. And learn how to use the reviews section properly.