I get reviews that tell me "waste of time, amateur hour, totally lacking," as well as reviews that say, "the author really involved you, wow it was so vivid, best in the genre I've read," and to three star reviews that don't say much. It is even across the board. I have no clue where I actually stand.
Well, if you have multiple reviews with a broad range, that by itself means you've gotten a lot of readers interested in leaving reviews (something that eludes most indies). It's really hard to draw conclusions from reviews if they are all over the place. Look at a national best seller like George R. R. Martin--his reviews range from "I wish I could give it 6 stars" to "I wish I could give it zero stars."
In your particular case (and without looking at your book), it sounds like you know how to tell a good story. The "amateur hour" comment might however give a person pause, because we indies don't want to come across as rank amateurs--if you're selling your work for money, you're a professional. So ask yourself, did you polish your prose as thoroughly as you could, then get it professionally edited? "Amateur" can mean that the reader was distracted from the story by typos, grammatical errors, sentences that didn't make sense. These sorts of things don't bother some readers at all, but they certainly bother others, so if you think the "amateur" label might apply to the quality of your prose, get an editor and then re-upload the edited manuscript.
Or alternately the "amateur" comment could just be somebody who'd hoped your book was going to be a thriller (or a romance or fantasy or at any rate something it wasn't) and was grumpy, or just didn't "get" it. Every single person who sells well gets negative reviews. Brush them off if they have nothing to do with your book, take them to heart as an encouragement to improve if they do.
Another thing to consider: Are your good reviews from people you know? Friends, family, or fellow writers?
If any are, they don't count (and some are likely against Amazon's Review guidelines).
Friends, family, and some fellow writers aren't unbiased. The first two are going to want to support and encourage you. The last group aren't generally going to want to be seen as "mean" (plus may ask you to review their book(s) in the future, so want a good one from you).
If they're all from strangers, well, GO YOU! for having created something that moves people to review it either way.