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I ain't sure at all, but they might even be neutral...

Emerald didn't attack till you ran into him with your submarine. Ruby didn't attack till you hit him with the highwind. Ultima didn't attack till you rammed into him and then chased him down after he tryed too avoid you. All the other Weopons waged war on Shinra too try and protect the planet so they were on Aeris side.
Basically all the weopons didn't attack till provoked except in the case where they attacked Shinra. Shinra is evil so therefore the weopons are good. Now as for the two weopons that didn't wage war on Shinra Emerald and Ruby these two could have helped out too save the planet but they didn't. Does this make them evil, not really. I don't remember them attacking till you ran into them xd .

I suppose it's just like they're a wild creature...minding their own business (and protecting the planet), but they get caught up in finding prey (which would be the team) that has run into them. So they fight back in defense.

And if you kill it/them, then you've become the predator. sweatdrop

Ah, I was about to say Neutral creatures, but after reading jupiters post, its seems very logical that they are "good". However that makes the the people on the planet "bad" :-/

i agree with that i also think that the weapon that opened the cut in the junion cannon did it on perpose i mean something that big makes only that big of a cut and doesnt kill tifa come on now be realistic

They are like Holy. They destroy whatever they need to to protect the planet. If humans are hurting the planet, then they need to destroy humans. I guess they are kinda neither and both at the same time.

You have your facts mixed up, for one Holy only came because Aeris told it too. Meteor was the threat too the planet at the time and it was triggered too try and stop it. Holy failed and the planet itself had too lend a hand in stopping Meteor from possibly blowing the planet in half. It is a very powerful materia indeed but a materia none the less so it doesn't has a specified target until the one using it gives it one. Second, saying neither or both at the same time is a contridiction and without clarifying what you mean it has no meaning.