I have a ton of characters, most of whom have green steel weapons and accessories. And something I've noticed over the last couple years (I've been playing for a very long time) is that GS weapons have largely fallen behind other level-comparable weapons. I mean, at this point, for a lot of characters, you're better off just using Barovian weapons, and those are 2 levels lower than GS!
Green Steel should always be the benchmark for ML 12 weapons (heck, I'd say ML 12-16).
At the very least, I'd like to see the base damage upped to at least 2 [W], and the extra damage effects (like shocking blast and such) brought into line with the new mechanics (+x dice on a critical instead of the old +x dice if a x2 multiplier, +y dice if x3, etc.).
Of course, this change would also necessitate a way to take your old GS weapon, stick it in a Stone of Change with x easily acquired ingredient, and get the new correct version of your weapon.