Although I don't agree entirely with people's criticism of Superman I can understand where they're coming from relating to the "Superman was a beacon of hope" line. It's more of a matter of wording I think..
During the BvS events we can't really say he was a "beacon" of anything considering how divisive people felt about him.
He wasn't exactly beloved by everyone, and Zack clearly lingered more on the people who hated/didn't trust Supes aspect ( False God scene, protesters at the congress scene, the failed hearing, does the world need a superman scene, clark watching a woman on the tv defaming him).
Sure there were people who liked him, but it wasn't nowhere near consensual, supes wasn't an america's sweetheart per se.
Although I think his sacrifice is the beginning of Superman's rise to his iconic status