(2d6+5)*6: Scorching Ray gives you three rays at 2nd level, plus one ray per extra spell level, so Scorching Ray V will have six rays. Do I misremember? I'm AFB but I'm pretty sure about this.
You roll 2d6+5, and multiply that by the number of rays that hit. See details in post #173 of this thread. (
http://www.enworld.org/forum/showth...-Official-Errata/page18&p=6638271#post6638271)
That's an optimistic interpretation of the errata. I hope you're right, but I'll be convinced once we get a confirming tweet or something.
I see. But why did you pick 5th level Scorching Ray? That seems random. But okay, 5th level it is.
Scorching Ray 5th level. You get this at 9th level. You can cast this once, or twice if you spend most of your sorcery points, or a third time if you cannibalize most of your other spells. I doubt you'll be doing Scorching Ray + Quicken more than once.
So this SR + Quicken combo is either (2d6+5)*6=72 plus Quicken Firebolt 2d10+5=16 so 88 total, or the other interpretation is (2d6)*6+5=47; +16=63. Once per day realistically, twice if you really like casting nothing but Fire Bolt for the rest of the day.
Let's see that Barbarian with just GWM at 9th level. On-demand advantage, of course, because when you have D24 effective HP while raging why wouldn't you. We won't even give him a magic weapon, despite the published modules indicating he probably has at least a +1 weapon at this point:
No -5/+10: (1d12+5+3)*2 = 29 regular attack, (1d12+5+3)*3=43.5 if he drops a minion with one of his swings, and an additional 1d12 + swing if he crits (50)
If we're generous and ignore the auto-advantage of the Barbarian and assume all the rays hit, then yes, the Sorcerer's nova does more damage, significantly so if we go with your interpretation of the new errata (sad we have to interpret it). Which is good, because the Sorcerer can do this realistically only once per long rest, while the Barbarian is doing this for 4 entire battles.
But now we add the -5/+10, which at 9th level should be a simple decision for the barbarian as he has a +9 to hit PLUS advantage, possibly more if he has a magic weapon:
-5/+10: (1d12+15+3)*2 = 49 regular attack, (1d12+15+3)*3=73.5 if he drops a minion with one of his swings, and an additional 1d12 + swing if he crits (80)
With GWM, the bonus attack and -5/+10, the barbarian's regular swings are not far behind the sorcerer's biggest spell of the day. That's not right.