The program is quite simple: Gain more self-confidence. Be "the highest authority" for your stories - if you think it's good, then it is good. The more people agree with you, the better.
(Oi, and if you think it's bad, then you get all those review saying it's good, so what then? ;-P)
*begin rambling*
Unfortunately, it's not that simple. As therhoda already said, reviews of praise make happy, for hours or maybe even for days. They can be the reason to get one's butt into gear and continue writing a chapter for a story, and they can be the reason to try even harder on diong your best.
Humans are like that - the right motivation lets us do things easier, faster, better. Unfortunately, if the motivation (You did great, I want more) doesn't agree with what we think of our work (my writing sucks, there is a mistake here, here and here), then you start to feel guilty.
Think about a review as someone's personal feelings about what you write. Like, take the reviews you give to my stories. You think that the chapter is worth a review. You even think it's worth a good review, a very encouraging review - so you take the time and write that review. Of course, you do see all the mistakes in my chapter. You see the typos, the point where the logic flow of the story was interrupted, maybe you also think about the charcterization being very slightly off 'I would've written XYZ here'. Still you give a good review.
See where I'm going?
People are very well aware of the story's flaws. They still like your writing.
You are afraid not to be able to match the standards of your audience, of that particular reviewer?
Good.
Turn that fear into hunger. Make it a hunger for improving yourself, your writing.
But don't expect that particular reviewer to review again. Even if the reviewer reviews again, maybe next time he or she won't have the time to write such a wonderful review and all you get is a "well done"... then you begin to wonder 'mmm... does that mean that this wasn't as good as the previous chapter'?
And what if, for some reason, you won't get any reviews? Maybe because ffnet ate them all. Or because you posted at a bad time... - I guess you're going through the same hell like all of us, waiting with baited breath for the first review, waiting to be able to say "I didn't fail, someone *did* like it.".
Another thought. Stop making one review "worthier" than the other. Sure, getting lengthy reviews is great, getting praise like that from someone who obviously "can write". But frankly said, I find it a slap in the face of every other person who ever left a review to say "Ah, I don't know if I can live up to that particular reviewer, because that person must be higher than everyone else - just look at how great the review is! Such style, such wording, such understanding of what I wanted to say!"
It's as if all the other reviews don't really matter, you know? Like if 'ordinary' reviwers are reviewers second class.
I mean, are you ever that anxious about keeping up the standard for your ordinary reviewer? Or are you a person who scrambles to attention because Mr. VIP Superstar just showed up at the doorstep of your school/work, and forgets about your ordinary 'customers' who come back every day and give you a smile, and help you through the worst of self-doubt?
i know that this is a very personal thing. I know that I treasure reviews of certain people, because those people mean something special for me. Like, the people who I 'talk' to on this board, or on IM and IRC. I admit that I think that their opinions might be honest - because they have no reason to make up a "well done". I like it that I do get a "Here and here, it can be better", may it be in a chat, in a review, or in a post here on the board.
Still, I do know that I have all the other 200 people who do read my Saiyuki stories (or any other stories), who I want to return for the next chapter. *THAT* is what I'm anxious about.
IF someone leaves a review, and a lengthy one at that, is makes me immensely happy. But ensuring that all the 200 people returned to read the next chapter, that's even more important. - And that is the difficult part.
*End of rambling*
I'm sorry if I stepped on your toes, or hurt you with anything I said here. I understand very well where you come from.
Just try to give your best. That's all you ever should do in writing, no matter who reads - because every reader deserves to get your best, hardest work. Including yourself.