I think I may be generous with the 2 stars.....we were served rancid olive oil (on asparagus), crispy paella (EVERY other time it has been cooked - not al dente), and Iberico ham that was kind of 'meh.'
Very loud - hard to hear conversation at out 2 top.
Server was lukewarm, clearly not thrilled to be there.
My advice? If you need to drop some money quickly use a slot machine instead. We actually did and won a bunch of money! At Serrano's you wont win anything but hopefully will find a bite or two of actual 'AUTHENTIC' Spanish cuisine, which is better than we did.