Although you posted this a while back, since I'm from Barcelona I'll give you my 2 cents: I would say that most people appreciate Gaudí and are proud of his works, but in the last 5 years or so I've been seeing a lot of letters to the editors complaining mostly about the massive influx of budget tourists (Ryanair, etc), who have turned the city into one big stag party, drinking and partying everywhere even during the night, making noise and leaving trash everywhere. I was recently in Park Güell with a friend who was visiting, and can confirm it: there was a group of 10 or so Brits drinking cans of the cheapest beer on the bench and a few minutes later they left leaving all the cans and plastic bags behind.