Perhaps I'm full of shit on this, but from my perspective it just seems like NA teams have a lot more aggression than EU teams. Because of this, to me atleast it seems that Invis-backstab plays are a little easier in that there is more chaos and opportunity. EU has a tendency to sit still until the very moment of the push, leaving little room for error on the Spy's part. It mostly feels like suicide plays.
Again, I could totally be talking bollocks on that.
But I think as a concept atleast, the Dead Ringer makes sense. I don't believe there's anything inherently wrong about Gunspy, as you trade gamechanging plays for some consistent damage output. As a Spy I think it's nice to have that option if you're having one of those games where you just can't seem to achieve anything with conventional play. I mean, you pretty much have to use it for Gunspying, as nobody competent ever really buys that you've died.
Personally I feel that the Amby nerf is a little harsh. At the absolute max range you're hitting 50 damage headshots, and past that you're not even hitting those. In a sense, the stock Revolver is a better long range weapon than the Amby. Imo there shouldnt be a range limit, and I think we should be doing 70 damage headshots across the board.
Also no I won't use Diamondback. It's a retarded weapon that should be removed. Rework it into a niche or something. Enforcer was retarded, then they nerfed it, and now it's bad for everything except wrecking Vaccinator Meds, which is fun af.