When Milly and I have played over the past 2, maybe 3 months I felt like warriors were king, myself. We typically won when we went double warrior and didn't do as well with just a single warrior. Since so many of the warriors can provide good damage now, you got the added benefit of survivability + the ability to kill. That's why I play Chen so much, and why I did play Zarya a lot.
I don't recommend solo Leoric for pleb play period, though. Just feels like he's too squishy, too easily chunked and doesn't provide enough otherwise. His heroics are some of the most high variance heroics in the game. They can literally singlehandedly win a fight at any given moment, but most of the time both are so easily avoided/escaped it's sickening. He's a far cry from my 65% winrate days with him summer/fall before last.