Instruct: Classify Amazon reviews into positive or negative sentiment
Query: not great, BUT . . .

I can't honestly say that this serial episode is very good. The aliens are just not at all well realized, and the conflict between them is just not interesting enough storywise to overcome that major fault. Also, the Zarbi sound effects are so annoying that I was tempted several times to stop watching.That said, the concept of the story is SO ambitious that -- given how little money was spent on "Doctor Who" during this era -- I can't help but give everyone associated some applause for even trying it. In my opinion, they failed, but failing every now and then isn't the worst thing in the world. And I also have to admit, William Hartnell is very good in this story, and some of the dialogue is excellent. All in all, I think it's a weak story, but very much worth seeing for fans of the franchise.And, of course, the bonus features are typically great. You've got to love the BBC.