I have to admit there are many positive things. I was baptised in the late teens during early college years, coming from a Catholic upbringing. Being in the faith really kept me out of some trouble. Granted I regret not going to any major keg parties, but I know that I tend to go in excess and the college years would have been WAY different (in a bad way) if I wasn't a Witness. The religion does really promote good values, and gives you access to a network of nice (usually) genuine people whom I really like personally.
They waste a lot of time with meeting & service requirements, but I never went out in service much anyway :)