It’s official: The Mets are the worst team in baseball.  And on Wednesday, especially, they looked the part.  Five weeks into the season and with a sky-high payroll, the mismatched disaster that is the Mets roster was overmatched again in a 14-2 loss to the lowly Nationals at Citi Field that wasn’t as close as the score might indicate.  “We have to be better,” Carlos Mendoza said after his team’s 16th loss in 19 games. “There’s no excuses. It’s been a long period of time here that we’re not playing well. We’ve got to fix it.”  Whether that’s even possible is a serious question.  With their latest defeat, when they allowed a season high in runs, the Mets fell to 10-20.  David Peterson reacts as he walks back to the dugout at the end of the first inning of the Mets’ 14-2 blowout loss to the Nationals on April 29, 2026 at Citi Field.…