How seriously do you take other peep's opinions?

Recently there has been so much hype surrounding a certain grey shaded book that I went trundling along to check it out on Amazon to see if it comes in Kindle (clearly I’d only heard half the news) and then I began to read some of the reviews. This isn’t the first time that I’ve decided to check out what people think about a read before I spend my money on it. Let’s go back to a week ago...

I was about to redo my roots (I’m getting married in two days and suffer greyage) and since my locks are black, I stay in the bathroom so not to drip dye anywhere and usually I read a book since I’m in there for a while. Anyway, I wanted something different (not historical romance) so I grabbed a book I got last year from the Romance Writer’s of Australia conference. A few pages in I was really enjoying the writing (YA angels and demons and whatnot) but realised that I wasn’t starting at the beginning. I grabbed my phone (also in the bathroom with me) and looked it up on Kindle (so I could start reading right away) but then I scrolled down to the reviews so I could try to work out where the series started. Anyway, the reviews were terrible. I was a little devastated. I need a book to read on my honeymoon next week and wanted an electronic one so I’m not dragging pages around everywhere.  Anyway, I stopped. I didn’t end up buying the book even thought the chapter I read from the third book was great. I started to think maybe I’ll read the third and if I like it, I’ll go back and get the others. Then the same happened with the grey shaded book. I’ve been hearing about it for weeks but had only ever had a half-hearted look at it since I was snowed under with revisions and wedding stuff. A couple of my friends are reading it and were chatting away on Facebook so I went to buy a copy and join in (starved for attention I am) but then I made the mistake once again of checking the reviews. The first one made me laugh out loud and share the words with the husband-to-be who also laughed. It was the second book in a week that I didn’t buy because of bad reviews. Which then made me think, how many people do the same and are turned off? Do you buy it anyway because you have a mind of your own and want to come to your own decision? Are people going to turn away from my book if anyone leaves a bad review? (haha, please don’t) So I’m opening it up to you. Do you leave bad reviews if you don’t like something or do you not waste your time? Do you leave reviews at all and most importantly what turns you off a book if you previously wanted to read it but then something changes your mind?...