The current commissioner of the FDA is former cardiologist Dr. Robert Califf
"A market-failure rationale requires a plausible story about how government, with its special abilities, might improve matters. It is not legitimate to look at the situation, notice risk, ignorance, and uncertainty, and declare “failure.” If we go down a checklist of market-failure rationales—adverse selection, externalities, natural monopoly, equity, etc.—we do not find one that can be invoked for FDA policies. Danzon and Keuffel (2007) argue that safety and efficacy information has public goods properties. Surely there is something to this, just as the knowledge conveyed by Underwriters’ Laboratories certification may be said to have some public goods properties. But, at best, public good aspects of information create an argument for information provision, not for the premarket banning of all pharmaceuticals." (http://www.fdareview.org/07_market_failure.php)
Many complaints arise in regards to what the FDA has and has not allowed for US citizens to consume, take, use, etc. Many preservatives used in food items in the US are not legal in other countries around the world. Also the the process to have certain medications, medical procedures, and other medicinal products is very extensive and is a touchy issue for some.
The main issue facing the FDA is drug regulation.