Why do so many people start with Atomic Axe? With the general lack of armor at those levels, Coda Blade is the far superior choice. For 1750 you get 40 AD (49 w/Mod), 10 pen, and wounding if you have that mod. With Atomic Axe you have 30 AD (39 w/Mod), Razor (which is a percentage) for 2250 that won't give you the same return on investment until 8-10.
My question is why start with it? Atomic Axe is a counter building tool, like Book of Eternity, that's strength comes later in the game rather than minutes 1-5. Personally I have seen it in one too many games and guides for GH to be comfortable with what I believe is an ineffective practice.