Been using the right click with Zen a lot more lately, feels like I'm decent with him now. I'm constantly silver or gold in damage but that is probably due to the FPS being low overall. Seems to me he is rarely picked in Bronze, I usually wait 10 seconds before I pick but it's almost always Lucio or Mercy.
The biggest weakness I have with him is getting killed by ults due to his lack of mobility and my poor positioning at times. Riptire, Dead Eye and Visor kill me way too often. I hear the sound cue but still end up dying to them half the time anyway.