I would like to mention that Fuzzy logic is still an active control system used in many industry applications.
In garbage fired power plants, concrete aggregate firing, hydraulics, and the control of flow of powdered 'fluids' in foundries to name a few. However, I will admit, I've only seen them used in 'one off' difficult to model projects, such as power plants and the such. However I have read papers like you that use it in robotics....
I would say it most certainly has it's place in research, and it is certainly used in many control areas that are near impossible to control in more traditional methods. However much like you'll see Neural Networks being sticker'd and used on/in everything under the sun.
Fuzzy logic suffered the same fate, but fell out of interest because of it...It was thought that you could throw away all the old tools and 'save the world'. But it became a marketing failure and other methods became (stayed?) the norm.
I don't think Fuzzy logic is 'dubious' in any way. I think it goes against the methods of many designers to be exact and well...not so fuzzy, and has a poor history of being used in junk machines, and lots of burnt memories.
It's an interesting field, one you should learn about, maybe even play around with in matlab or your flavour and learn about....if not for anything else than to say you like something else more.
Some reading materials:
NOE TS Fuzzy Modelling of Nonlinear Dynamic
Systems with Uncertainties using Symbolic
Advances in Industrial Control
^this is more about PIDS and MPCs
Fuzzy Logic, Identification and Predictive Control
and just for sources sake, a list (in german anyways) of successful applications of Fuzzy logic (maybe just scroll through the pictures to get an idea if you can't read german). As I said, it has it's place....it's just not very big.