It is super great. Did you know that they do yearly surveys, and all the regular riders of the metro look out for the surveyors?
This year the metro received a rating of 8/10 (really, really good) by people who rode it regularly.
It's also easy for tourists to use the metro. But it's not the only transport in BCN. This city also has: city busses, neighborhood busses (teeny and adorable), three funiculars, trams, and these commuter trains called ferrocarriles (both below and above ground).
But the cutest public transportation? This old-fashioned trolley. I snapped a few photos of it in the maintenance shed the other day.