I'm not going to argue about his strength/weakness or how OP/UP he might be, rather, I would like to talk about his design and how it feels to play him.
I don't like the way his Blighted Quiver works. It's not very fulfilling in regards to the rest of his kit.
Whenever I try to "optimize" my play and use an ability after every 3 auto-attacks, I can't help but feel bad.
If I trigger the stacks with Q, it's most often the shortest Q and thus minimal damage from Q. That feels kinda wasted. Not to mention that you want to save that Q to snipe low-hp fleeing enemies when they flash away from you (very, very often).
Using R, his ult to trigger it is also in rare situations as you will most often want to use that ult as initiation or help in escape.
So, you pretty much have just E which is also often better to use earlier in fights due to the utility it provides.
I know these are choices to increase his gameplay, but I think their "cost" is too high. Whichever choice I make, I often wonder would the other choice be better and I always feel like I lost something.
Maybe that's just me. What do you think? What do other Varus players think?
P.S. I know you (and all the other Rioters) are now swamped with the Championship, but I'd be grateful if you could share your thoughts on the matter (now or after the finals, same to me). Thanks!