Execute nerf is going to hurt, yes, but as Sgtjonson stated, this is a nerf that's been suggested early, and honestly, I do agree that the execute nerf may be a good thing.
Hear me out, yes, doing colossal numbers with execute is fun, but having your rotation gimped because execute will make your DPS go skyrocket isn't fun. It leaves you to do meh all fight before you actually do good. I'd rather have just a slight DPS increase during my execute phases, rather than a HUGE DPS increase during execute phases, like right now, but an otherwise lower overall DPS out of execute phases.
Besides, with the new SD mechanics making OP free after using execute, that itself will consist a huge DPS increase during execute phases, not even by execute's damage itself.
As for the reck nerf, if you look at our new set bonus, stacking reck with banner will give us lots of crit, and that's exactly what they want us to. They want recklessness and skull banner to line up together. Plus, in PVP, we'll be able to line up avatar, banner and recklessness every time. So this may end up being a pretty cool thing.