Damage Properties and Questions about W/* build

Sorry I got a noob question here.

What does the Fire/Cold/Earth/Lighting damage of Melee Weapon actually do?
Some people said the Cold Damage will slow down people's movement and attack. Some people said the Fire Damage will do much more damage on most monsters and players. Are they true? If so, does it mean that if I equip an Axe with Cold Damage? Will it slow down my opponents (in terms of attack speed and moving speed) in PvP? How about Fire/Earth/Lightning damage?

Another question:

From what I saw, most Warriors are W/Mo, W/E, W/R. I think it is because basically:
W/Mo can tank well in both PvP and PvE
W/E is common for its knockdown build
W/R is for fame farming by abusing the IWAY team formation
So how about W/Me and W/N?
Are W/Me and W/N strong in PvP and PvE?
Should I go for Strength or Tactic for W/Me and W/N build?

Thanks so much for your help!! Much appreciate that!

Damage Calculator w/mods
http://www.guildwarsguru.com/forum/s...d+%2B+da mage

This article is also a good read on damage and armor but not a complete answer to mod damage.
http://www.guildwarsguru.com/content...nics-id674.php

Some mods like vamp are easy to calculate.

I personally do not use The Fire or Ice mods often. I do have an IDS and FDS but they just collect dust unless I am in the Ring of Fire. I can say that I do not see a speed diff when useing my IDS on fire imps.

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You will not see to many high ladder W/Mo in PvP unless they are using all W skills. The main types are W/Ele, W/R (Iway), and W/N.

If you do some searching in the PvP and GvG forums you will see some W/N builds there if you want ideas. I do not see too many W/Mes in PvP. You will see the occasional W/Mes farming builds and for some reason IW builds in PvE. These builds are designed for specific Mes skills and there are few skills which are relevant for a warrior to use.