I don't look at reviews, and buy my ebooks the way I used to buy paper books by reading the blurb and having a quick glace inside... Plenty of fairly random buys that way (either indie or trad published - it's not a deciding factor for me). I'd rather get a book, read it and then if I don't like it for whatever reason then at least I know that a particular author isn't for me rather then base my purchasing decisions on other people's opinions
Edit: and in the case of the book mentioned here, based on blurb (both in term of genre and style of writing) no I wouldn't buy it!