Honesty in reviews, as in all other facets of life, remains the best policy. That's my personal opinion, at least.
When writing a review, we should try not to extol unwarranted praise on mediocre offerings that show little or no potential, nor should one hatefully bash or "zero bomb" anything that actually possesses merit. Sometimes it's as easy as being able to tell if someone put real time and effort into a project, as opposed to just cranking out some no-account rubbish that was haphazardly and very unprofessionally thrown together.
A very simple mantra that I try to keep in mind while offering up feedback is "CONstructive, not DEstructive." Admittedly, I tend to err on the side of kindness, and offer up any suggestions for improvement if I have any and feel that they could be beneficial. If not, then I'm content to just let the artist know that I really enjoy the work. In either instance, I believe that the review should, by design, encourage an artist and make them want to improve, rather than make someone feel discouraged.
There are, of course, a lot of things to keep in mind regarding the reception of reviews, as well. One very simple truth is that you just can't please everybody. Ever. It's frustrating to get a review where someone says something like, "This really isn't my kind of thing," or "I don't like it," without any kind of explanation or actual critique. But hey, that's just the way it is. For me, personally, I'm also kind of bothered by the one-liner reviews that say "This is awesome!" and the like. But hey, we've all got people to see and places to be, so maybe that's all any of us really have time for—unless we make the time for more.
And really, it's still better than getting no review at all.
Nue22
People want honesty but only when it's falsely pandering to them. I've been posting tracks for over like 8 years now and they still tell me the same thing over and over again "lower the bass" "lower the bass" "omg the bass is too high" and I lowered it and lowered it until I got frustrated to the point of just making kicks with no bass but somehow these comments kept rolling in telling me to lower the bass when there was no more bass so what the hell am I supposed to do?
etherealwinds
Ahh yes, it can be quite frustrating when lots of people are saying something over and over again that you're not able to hear. I've certainly had situations like that where I simply either couldn't hear what others heard, or I just generally disagreed and put it down to differences in preferences. That said, when people have said the same thing over and over, it's good to have somebody to not just make an idle statement, but actually give some sort of possible specific solution and a bit more clarity in where exactly the issue lies. I've gotten many reviews that are clear and specific, and those IMO are the best reviews because it's managed to expand my knowledge beyond where it already was :)