I note that many people who have gone there say there is not much to see except the dragon gate. It is an early Gaudi work for the Guell estate (mainly a stable), therefore I do not except something spectacular. But as I am interested in checking out Gaudi's early works (Torre Bellesguard, Colonia Guell, Palau Guell, etc) this time, I decided to go. If you don't want to pay the entrance fee, you can still view the dragon gate and other features of the structure from the outside.
The staff at the ticket office was very enthusiastic in explaining the history and use of the place, some details of the design, and also showed me photos of some other Gaudi's works (including those not in Barcelona). I asked him a number of questions which he glady answered.
I understand that the place is under the University of Barcelona and is open for public viewing as part of the modernista heritage of Barcelona. For the price of a cup of coffee (I paid €2.5 to enter), if I could contribute in a very small way to help maintain this piece of heritage, I would gladly do that.