I initially enlisted to get my schooling paid for (at least partially), as well as get my foot into the door in the intelligence field. I'd say in that aspect, I definitely succeeded. However, one facet of the Army Reserve that didn't quite fit my needs were the inflexibility in my own personal choices, namely locations I could live or places I could travel to.
In addition, I never really got to see tangible proof that I personally had had any impact or significance on the overall mission. The Army is one big team, and I'm proud to be on that team, but I'd also like to see evidence of my own hard work, and have my own personal responsibilities.