I have noticed that in the multiplayer, the weapon customization meters are not reliable. For instance the harrier rifle on level one has a decent amount of damage per second when the weapon customization chart would indicate otherwise. Is there a way of actually quantifying the damage like the powers. Is there an online source like a wiki that has this information?
Here's a wiki page, check under the Weapon Types category. These are more or less reliable: http://masseffect.wikia.com/wiki/Weapons#Mass_Effect_3
http://masseffect.wikia.com/ is a rather useful site anyway, most ME-related answers can be found there.