Now, let me back track a bit. I will never change MAJOR plot-lines and such either, because they are out lined already and to change a plot-line could hurt the next couple of novels. Let me give you an actual example so you can see what I am talking about:
Many reviews of Defenders of the Sacred Land stated that Dorenn was whiny, weak, too easily led about etc. One even went so far as to say it was a major flaw that the mentor characters kept denying him answers to what was going to happen or what would happen to him next. (keeping knowledge away from him unnecessarily) So, in the the second book I actually had him second guessing what he was told to do and made him almost apologetic. It came out silly and didn't fit at all. In fact, I had to remember (and I was reminded by my older daughter) that Defenders is book 1 of a series where Dorenn is a shockingly ignorant newbie! I changed him back to the way I had him in the first place, because he was meant to evolve based on his experiences. Mentor characters filled him in on knowledge as they deemed would be appropriate for him to be able to handle the knowledge and use it wisely. This is how things work in real life! Most parents do not try to school their 2 year old about sex, they release the knowledge as the child matures into an adult and based on when they deem necessary for the child to know in order to make better decisions.
I realized that I was tempted to use reviews in the role of a critique group. DO NOT DO THIS! A critique group and/or beta readers fill this role much better than reviewers! The reason we are tempted is that we want the book to be a huge success but we have to remember that NO amount of reviews, beta reading, critique grouping or anything else will make EVERYONE happy. You are still going to get the 1 and 2 star reviews. The problem is that reviews are so unreliable and they are by far the lowest form of critique. They give almost no useable feedback to the author and rarely give any to the next potential reader. Some reviews I have seen moan about something (say a character flaw) that gets addressed in the very next book. The flaw is there to make the character more interesting, more believable etc.
Here is one huge reason reviews are unreliable. I could review that chicken fried steak is terrible and that NO ONE should ever eat it. Furthermore, biscuits and gravy is a disgusting meal, if you can call it that, and these two ingredients should never be mixed together ever! (I live in the south and in reality, I really do dislike both of these dishes) but I am WAY in the minority around here. This is just my one opinion. Thousands who love both these dishes can tell you how wrong I am , but you will never know for sure until YOU try it for yourself.
Moral: Don't let reviews influence your writing one way or the other! (unless you get a bunch of bad editing/grammar/spelling reviews, that kind of review is not really opinion based and you probably need to hire an editor)
Like or dislike things based on what your opinion is by trying them for yourself!
If you want feedback and critique that is helpful and will help your writing improve join a writer's group, critique group, or get beta readers to give you opinions.