As nice as Fenway Park is, it's a million miles from the end of the discussion.
Are we discussing size or the merit of sporting venues?
The answer then depends if you want brass band playing, baton twirling, megaphone-backed, GA+ nonsense, or a visceral, passionate, organic, balls-out atmosphere.
There's no US stadium that stands up to Bramall Lane, let alone our very best football grounds.