Here is a criticism of CFLs:
http://www.prisonplanet.com/articles/march2007/130307Dimwits.htm
The writer raises some interesting issues:
  • They can't be used in ovens or freezers
  • They need ventilation
  • They require more energy to manufacture
  • They have a short life if switched frequently
  • They don't fit in all fixtures
  • They contain mercury

The Energy Star site does little to dispel some of the concerns:
http://www.energystar.gov/index.cfm?c=cfls.pr_cfls

How many of these items are going to be a problem?