Why anyone feels the need to critically analyze the game play of others like this is beyond me. 
Both PC and CB have pros and cons.
What started this whole thing was Drasca implying the ability is garbage compared to PC (along with some misinformation).
Snakebite has proved many times now that CB is on par with PC in various situations.
You and Drasca are just nitpicking now.
If by proving, you mean "making video when over promoted player spam some skill" probably you are right.
If you ignore e-peen show of we can sum up pros and cons:
1. Cool beats - no crits, require aiming, projectile which can miss knock downed target and moving target. Problem is even more annoying when not hosting. Based around DoT damage, would aggro groups or archers and other enemies damaged by aoe on you. Because damage is purely as DoT you need to survive enough long to really kill something. Gameplay showed in videos where you just rush or stand in the middle of map eating arrow does not work for most players.
Works with encore. Sucks when virtuoso is ambushed by stalker or shadow.
2. Power Chord - direct damage, aoe detonator, crits are working. Does not work with encore. Does not require aiming and even facing target. Can dispel which helps a lot on venatori. No aiming needed no problems with knockdowned or running fast targets.
Aggro generated with it is more manageable, because it's where you cast not at long range. CB fans does not mentioned it but one cool beats can aggro half of the map on virtuoso, when you try to use it at long range to get ticks on stacked spawned group.
Best ability virtuoso has for dealing with ambush and groups of enemies in close range.
How many players has enough defense on virtuoso to play CB without risk of being dead by random arrow? How many players can rush the whole zone tagging everything on way and eating damage like candies? How much players has enough willpower to boost CB damage from poor zones of ~500 to something more like 1k daamage.
500 damage tick is 8-9 ticks to kill one basic unit on perilous. Ticks are every what? 2 seconds?
I would say that very few players can do it. Also all of them can just take Power Chord and just run and spam it in the same way without even trying to target something. Pretty much result would be the same, but effort way lower.
For average player which get arrows on face for 300 damage getting aggro on stacked group of archers in long range just to "tag" something with CB can be lethal. Sometimes better not aggro them. This makes CB a song which need to be cast very carefully for average player. You need to think where and when and on whom to cast it.
From my point of view this effort which I need to put into using CB in proper way isn't worth result at all. I would prefer spam barrier and change to PC when something is close to me.