Coming from a city that is having a bit of an identity crisis and relies heavily on tourist money, the impression I got of Barcelona is that the city itself is very much a theme park for English tourists. It really seemed like Catalan culture was whitewashed pretty successfully (e.g. pintxos everywhere). In terms of combating that theme-park mentality, Sagrada Família is certainly not where I'd start (then again I don't live in Barcelona).
Parc Güell was especially over the top and cartoonish, less in the architecture, but more in the throngs of selfie sticks. It's gone from a thoughtfully designed park to a caricature.
Sagrada Família was, OTOH, a pretty stark contrast. I did the self-guided audio tour and went up into the Nativity facade (not the newer one) and was just floored. I fully expected the audio tour to be full of self-promotion, but even the 99PI episode on Sagrada Família left me with the impression that Gaudí wanted to see SF completed and that currently painstaking effort is being made to keep things as true to his desires as possible.
Obviously things won't be done exactly as Gaudí would've done them, but that's an artifact of technology changing over time. Much like any other aged building, Sagrada Família would've needed a restoration at some point. For better or worse, the primary function of Sagrada Família is as a museum / tourist destination and it's been that way for many years.