This is actually a pretty big development. For the longest time, the Mexican government has said the country is safe except for pockets near the US border. Mexico City is far from that border. Still, Amlo’s approval is 58% as of May 2020.
https://www.as-coa.org/articles/approval-tracker-mexicos-president-amlo
AMLO has actually been ok, considering his reputation going in. That’s not saying much, but he’s much better than Vincente Fox, or any of the other recent Mexican Presidents.