Yup. I love playing Winston, but in Solo Q is almost impossible to do something unless you got a guy on your team that understands what you do. The other day I went into a match were we had Hanzo, Widow, Sombra, Dva and Junkrat. I went Zen. They started to tell me that I should go Mercy. "Nah guys, not gonna babysit you. Use Sombra's hacked healthpacks". Carried the whole team, and after we won a couple of those guys messaged me with "GG nice Zen". The next game I got golden heals with Zen having a Mercy in our team.
What I mean is, play a hero you are comfortable with. In solo Q the team composition is not that important (I mean, it's still pretty important when facing organized teams, but you can win matches with the weirdest picks ever. I mean, I got a win in Gibraltar with an attack Symmetra on my team).