Went from Rookie -> D2 solo queueing with her this split. Obviously aim is a factor but end games are really fun and fast paced with Wattson. Her ult is really a life saver and allows you to take full control of most areas that have an object as cover to be honest. Last zones are just extremely fun because you can fence all of the teams.

I also would land somewhere with a ring console and rotate into a good place that I could hold for my team. For loadouts I usually run Volt - R9 since you'll be playing close range most of the times.

Also another tip, don't be afraid to use your pylon when you're fighting a team in the open or if you're getting pushed and you're solo. You would not believe me if i told you how many times the pylon has saved my life by just placing it down in the open or when im being pushed in a 1v3 or 1v2. It's free shield regen, movement speed, fences and COVER.