Brooklyn’s $1 billion Barclays Center opens tomorrow, when rapper Jay-Z leads off with eight sold-out shows in the 19,000-seat concert hall. The building has engendered all sorts of criticism: it has virtually no parking or places for idling Town Cars — the high rollers and corporate types filling the executive boxes are going to take the subway to Brooklyn? Hah! Architecture critics are piling on the Center, complaining about its materials and its ugliness. Sample the scorn here.