You probably did hit the nail on the head for a lot of people actually. The CP is all about what you are wanting and expecting from it versus what you actually get. A lot of CPers go down there expecting a semester off from school and parties every day, all day. The CP is work. Its life. And sometimes, it has its bad moments. But nothing is ever perfect. If anything the bad moments are a learning process, and besides, the many many good ones do more than cover them up.
My feeling, based on being an alumni myself and actually seeing it firsthand, is more than half of CPers go down expecting an easy ride and parties everyday, but get shellshocked when they find out they have to work a lot and deal with thousands of guests a day, some of which aren't the most pleasant people to work with. If you take it for what it is, you'll come out loving it, missing it always, and remembering all the fun you had. If you take it for what it is and how its different from what you wanted it to be, I can definetly see you leaving very disappointed.
There's a reason why they say "look to your left, look to your right. One of the people on either side of you won't be here when the program ends." I had a roommate on each side of me. Both good buddies of mine now, but one more than the other.
The one on my right left 2 months into the program.