I have a friend, he needs helpFollow

imo the high end armor is can either be obtained from instances or rep items (tanking armor) and dps armor can be obtained from pvp (arena). if you look at the epic BS armor (bulwark of kings) and its upgrades, there isn't much of a difference between each upgrade. also, epic weapons are much more easily craftable than they are obtainable, and the jump in dps from the first version of many weps to the second version is considerable (planar edge ~84 dps, black planar edge ~97dps).

sword>axe because it trumps axe in pvp... the main draw of axe spec is +5% crit, and above a certain bracket in arenas you encounter 300-400+ resilience which basically negates all of that crit chance with axe spec. however, there is no defense against sword spec's extra attack proc. also, i believe the extra attack can proc flurry and other haste procs, and more haste = more dps/rage. i believe the spec says 5% chance to proc an extra attack, but anecdotal evidence suggests that it procs often enough to make the effect noticeable.

flurry is ESSENTIAL. i try to correct any dps warrior i come across that doesn't have it spec'd. why wouldn't you want a 25% haste with every critical hit? add that to other haste buffs like the abacus trink, the haste proc from weps like the drakefist hammer and a windfury totem and your personal dps would go through the ROOF. imagine swinging something like deep thunder or stormherald at a sub 2 second attack speed. that works for both pve and pvp. pvp-wise, imagine you're swinging deep thunder, have 5/5 mace spec and the abacus trink... if you happen to land a crit and flurry procs, then you could pop your trink and pretty much stunlock your opponent to death.

as far as the rest of your friend's build, you have to find out if he is focused on pvp or pve, as this will tweak his build slightly. for instance, he might want to max out imp demo shout and commanding presence on his way down to 5/5 enrage and flurry for pve... but then he might want 5/5 unbridled wrath and 3/3 blood craze on his way down to flurry for pvp. also, tell him that blood frenzy would be more useful to help buff melee dps in a raid.