You can't tell me that the Benchmade 710 doesn't have a sexy blade profile! The reason behind the recurve blade shape has already been covered above, I think the reason they get a bad rap is:
1. Hard to sharpen for most (get a Sharpmaker)
2. Usually combined with a tanto blade shape, a "double weak-sauce" for many knife aficionados
3. Typically used in overbuilt "tacticool" folders
I only own one knife with a recurve, the M390 Benchmade 710. It is a very slight recurve and I think it looks elegant. In a 4" blade it works well too; a nice amount of belly to work with, a sharp and usable drop point tip, and a slight recurve towards the ricasso that excels at cutting rope or string etc. I have also seen people grind the recurve out of the 710 and it seems to lose a bit of the aesthetics of the knife. Not to mention that in this type of blade the recurve functions very well. With that being said I do typically avoid them for the reasons above.... no offense to anyone as we all have different preferences but typically the tanto blade, combo edge, black blade and recurve crowd seems to be in the same camp. But hey, clearly they sell or no company would produce them. I think they also oddly enough appeal to people who can't sharpen for the same reason that serrations appeal no non-knife folks. Even when dull as a rock they cut better than a plain straight edge because of the blade shape.