I would suggest putting Scope Upgrade in the level 20 talent choices, perhaps with a 10% range buff to account for coming a little later. This would keep the total bonus at 30%, which is a little less than what ranged assassins like Nova, Raynor, and Valla can attain (40%), but since it also affects one of her abilities, I think it would be a fair trade, since the aforementioned heroes' talents come at level 20 as well. I think replacing Bolt of the Storm would make sense, because your kit...

You should add Medhiv to the higher ends of dangerous - if images aren't managed well, polybomb is a huge pain, protect can negate a huge amount of your damage, he can reveal you, cloak his allies that you're targeting (which you can't break because you don't have aoe/skillshots)... all in all he has a lot of tools to mess Samuro up (if you can get him alone, not so much, but he teamfights very well). Also, I have to argue that Samuro has pretty good waveclear - images do decent damage,...