Hmmmmm .... and there was me recalling (or mis-remembering?) that the Amex had supposedly been designed with superb acoustics that would intensify the crowd noise???
The OP asks "why are English football grounds boring?" and bemoans the absence of fireworks, flares, flags and standing. I wouldn't mind betting that Roma fans will stand for 95 minutes and will have a variety of flares, flags and fireworks to hand???