Okay, one Smith taking on two Dragoons IS a little ridiculous, but it's pretty funny that you tried to make it sound like a Smith could take on four or five. Did it happen more than once?
Honestly, I don't see much to your argument at all.
#1 "same armor as dreadnight, better than dragoon and samurai"
- Yes, samurai have *lousy* armor. But the dragoon has almost the exact same armor as the smith. Iron and Chainmail, with one piece of diamond. Leggings for dragoon, chest for smith. This is a difference of one single diamond (or a .07 efficiency according to the Minecraft Wiki). Please stop using vagueness to make it sound worse than it is.
#2 "they get a diamond axe, that does the same damage as a stone sword"
- ...They also get the stone sword. Crafters get stone swords, too. I don't understand the point of this being mentioned at all.
#3 "with enough food and repair set to a hotkey, they are virtualy invincible."
- I think that with enough food, anyone is virtually invincibly. But I do understand your point here.
The main thing is, you guys have PvP skills that no Crafter has, nor will we ever have any PvP skills. Jump. Stone Skin. Drain Soul. Bladegrasp... Repair? I don't think there's any worry of having the server overrun with Smiths going around killing everyone. I think that the particular Smith you went up against just happened to be a good PvPer. If you get your butt handed to you every time you go up against a Smith, let me know and I'll sympathize. Until then, don't try to get a class nerfed just because one player bested you in a PvP match.