Disagree. It's the same animation regardless of weapon length, so it doesn't need to be discussed. The left-to-right swing isn't a close-range "tactic", it's just one of the three attacks the pick has!
Also, I believe you're off in your first post about the "shape" of the weapon doing anything at all. AFAIK, the models may be curved, but the code views them as straight weapons and merely takes length into account... A good example is Balbaroth's scimitar, and how talented he was at utilizing this "ghost" straight hitbox while the blade ingame didn't actually touch your model.
Anyway. Pick does good damage, short size balances it. Don't see a problem.