eriol33, congratulate on your published novel.
Don’t feel down because of the negative reviews. Most of the times you will find the ratios of negative reviews are always much more than the positive one. Although you cannot please everyone in the world, there are always some would like your work and keep you going.
How to handle critic? First you need to expect all kinds of criticism. Book reviews are pretty personal. Sometime you get a negative review because it doesn’t fit in the reviewer’s taste. After all fiction, music and art is abstract and we interpreting it with our own version. Judge the critics yourself to see if the reviewer really read through your works before giving out the comments. Take note to the critics, especially the technical one. It will help you to improve.
My personal advise on handle critics—just nod and take it. Because people will criticize more if you defend yourself. You will get used to it.
How ya doing, buddy?