I hear ya. My first experience with the original Grimlock mold was the G2 version. (Which is why I love the first Classic Grimlock, my first Grim was the Pretender and seeing those nods was GLORIOUS!)I'm so torn by the fact that Grimlock is going to be an absolutely delightful pain in the eyes, but one of my earliest TF memories is getting a blue G2 Grimmy for my birthday, so. Augh.
That said, I can also look at it from the perspective that a "proper" G2 Grimlock is just a color swap from his grey to blue. It's actually kind of boring, while doing the unproduced deco is something reasonably new and different and is more distinctive from his other two releases.