Proper quacks even announce that they're cherry-picking in the title... An Overview of Positive Homeopathy Research (PDF).
As far as I can tell, there is a strong trend, at least in the medical sciences towards more rigorous meta-analyses (eg, the Cochrane Reviews) which to a large extent avoid this problem. I'm not sure to what extent meta-analyses of this type are the norm in other sciences.
I think homeopathy is as silly as you do, but there are reasons to look at only the positive results, and the first step to doing it right is acknowledging what you're doing, so I don't fault them for the title.
Consider cases where there are a lot of unknowns on how to do it right. Most studies will find no effect, which is very good evidence that the average researcher can't make it work and you shouldn't just ask a random researcher to can treat you. However, if you look at the distribution, you might find that there's a false positive distribution and a...
Thus the subtitle of this blog posting at PLoS, referencing this article on "Cigarette smoking: an underused tool in high-performance endurance training". The point being that you can write a review article to argue anything you want, with sufficient cherry-picking and chains of links.
If you are doing actual experiments and making observations or proving theorems, then to a large extent -- larger in some sciences than in others -- you are constrained by the brute facts. But when writing secondary literature, especially in areas where data is generally fuzzier, it is easy, whether deliberately or not, to write to a bottom line, including findings you like and excluding those you don't.
Something to bear in mind when reading or writing any review article.