My first Constructive criticism--or--Anyone Else Out There Write Fan Fictions ?Some

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I've mentioned elsewhere that I am writing a fan fiction over on FF.net. While I've written several fan fictions over the years, I've never posted any on that site. A few people sort of indicated that I should, so I did. I've received quite a few "reviews" which were more comments like "I like this" or "Can't wait for the next chapter". Well, today I received my first "criticism". The reader pointed out that 1) there's a plot hole in my story. I told her I actually knew that, but another friend who'd read the story said they didn't take it as such, so I kind of ignored it. 2) The reader said that she didn't think that a certain character would act a certain way because of "What he'd been through". While I agreed with her a certain way, like I said to her, a) I don't tend to write canon, and b)all the character has ever said is "You don't know what I've been through!"--nobody really knows, so one can't base how he acted on that. I saw her points in a lot of ways, and while one day I may go back to fix the plot hole--I don't know if I should drastically change my story or not. I mean, I got what the reader meant by her critiques, but...? I don't know if that means I should go back and change everything. I'm just glad that the critique didn't make me freak out like I would have in the past ("My stories are my babies and how dare you say something bad about them!"). LOL--I know, took me long enough to grow up, right? I think that that's one reason I never posted anything on FF.net, though--I was nervous about what people would say. Anyway, anyone else out there write fan fiction? How do you take critiques if you get any?