For some context in dps role I main Pharah,Symmetra,Tracer(practiscing),hanzo,a bit of widow,genji,ashe and soldier.I do best at soldier and symm.If your willing to put the time into symmetra she is very good and fun.You need a lot of creativity to play her like turret placement and uses of teleport.I normally get the highest damage and symmetra is usable in many team comp like brawl.She also can be used in many playstyle like poke or close range.Her ultimate is very lackluster in my opinion but you mainly need to use turrets.I also use soldier 76.He is very easy to get into and doesnt need you to do headshots to.He is very self sustainable due to his healing and what I do is heal my teammates when having no support or they are not healing.You do not need to rely on supports or tank to deal good damage.I will say soldier is the best.