I agree with Dee's answer. To me, the term "review" makes me think of movie reviews or book reviews, where positive or negative opinions are allowed and expected. When you post a story on a site that has a place for reviews and ratings, you're opening yourself up for both. I don't expect all reviews to be positive, although if someone is going to leave a negative review, I would hope they would at least say SOMETHING positive and leave some constructive criticism, as opposed to just criticism, especially for a work in progress that still can be improved.
So on that note, I do think there's a difference between the two. Constructive criticism is - or can be - a part of reviewing.
Personally, I'm not into leaving constructive criticism either unless I'm asked, or unless I feel like there's just one thing I can point out that would make a difference in a story that already has a lot of potential. For example, I left a review once for a story that I really liked, and I told the author how much I liked the story and how I enjoyed her character-writing and whatnot, but then I pointed out that one thing she might want to watch is her tenses, cause she tended to switch tenses a lot. I didn't think I was out of line in saying that because the rest of my review was very positive, and just making sure she stuck to one tense would have done so much to make her story even better.
I'm open to that kind of constructive criticism on my own stories. Like I said in one of the other threads, what I don't like is when it's given with that "holier than thou" attitude Mare mentioned, like "I'm better than you, and I know everything about writing, so here's how you should write your story." Um, no. Don't go there. LOL