After all, if you end up being published, LOTS of people are going to be reading your work. And they are all going to have an opinion - good, bad, indifferent and sometimes vaguely stalkerish.
The sooner you get used to people commenting on your work the less therapy you'll need when a reviewer says they'd rather dig out their brain with a spork than read any more of your book. (This comment happened to a friend of mine.)
Having said that, sometimes feedback can be confusing and contradictory - Halo for example has received mostly praise, but also this... 'I hate the angels.' 'I love the angels.' 'Why don't you make the angels demons instead?' and this one, which made me grin: 'I like the angels, but I'm not sure about the cussing.'
Ahem, my angels don't do anything as polite as 'cuss'. They swear and use guns and are not demons because otherwise it would be a book about demons. I guess the lesson is, you can't please everybody, so please yourself...and ignore the spork users.