I only play it on PC so I really don't know how hard it is to aim in PS4 with a controller and how it compares to aiming with a mouse. I would assume is harder with the controller and than no one can't take Pharrahs out in console lol, but aside from that having many hours doesn't guarantee you to be good or bad, or at least it isn't a measure that relate directly to your skill level.
I can be wrong about this but I would consider having around 2.5 (or above) eliminations per life in the goodish area. If you average below on that you definitely need to work on your aiming and positioning but if you're already at that level then the next thing to improve would be to make the kills you make to count and being meaningful. That means you learn to prioritize targets, like instead of shooting the tanks you should always go for the mercys and dps first. Sometimes you can have a lot of kills and still lose if you let the mercy alive or the enemy dps that is whipping your entire team.
The problem with Widow is she tends to be a bit of a niche character, so it's difficult for your team to adapt around her if you're just playing with randoms but if you like her you should just keep playing her and trying to figure out ways to keep improving.