I get the reasoning behind this, but part of my problem with this is that it doesn't really lower the number of "casts" I have to make of AoEs vs trash mobs either way (though, to be fair, neither does current Scourge). If a DPS boosting inherent isn't making me use less attacks, it's not doing anything. Personally, I think Scourge could use bigger values in the early part of the ramp up, but it's a pretty precarious balance - I think the current value might be too low, though, if there's any core problem with Corrs as an archetype. Damage relative to Defenders is also mildly problematic, but I'd fear that a ramp up in damage scale could send Corrs flying from "good but occasionally outclassed" to "ridiculous".
I think current Scourge is slightly better in that it's physically possible for it to lower my AoE casts from ~4 to ~3 in niche situations, though.
On a sort of tangential topic , my personal biggest issue with Corruptors is that there's really one piece of content where I feel like they should, mechanically, shine - Summer Blockbuster - and they just. don't. There's not really a fix for it, but it's kind of frustrating that the only content I could really describe as a "Boss rush without incarnates" ends up locking Corrs out of 2 powers that would let them differentiate themselves from Defenders. I really like Summer Blockbuster as a piece of content, so it's just disappointing.
Edit: Favorite Primary is for sure Water - it's very active, has access to a great "burst window" power in tidal forces, and has several AoEs, which feel like they mostly scale well with Scourge. Ice and Fire are also obvious standouts.
Secondaries - Time, Cold, Dark. Proactive sets that let you throw out your debuffs and then get to attacking, hopefully just after the first wave of AoEs hit so you Scourge better.