Okay everyone, it's time I let you in on a little shaman secret. Brain Hacker is actually an awesome Shaman weapon, and everyone should buy it at level 55.
But how is this, you ask? Isn't a slow two-handed weapon mandatory for all classes that fight in melee?
That's where you're wrong, kiddo.
Sometime halfway through tBC, a 3 second cooldown was added to Windfury - basically this made it so that it didn't proc several times in a row. However, many players forget that in vanilla, Windfury has no cooldown. This means that the only thing that would give shamans a reason to prefer slow weapons over fast ones would be their only weapon-damage based ability - Stormstrike, an ability that is on a 20 second cooldown and contributes little to our physical DPS anyway.
But alright. Slight advantage to slow weapons there. Stormstrike burst is cool indeed. But are there any advantages to having a fast weapons? There are a few minor ones actually, yes.
One advantage is that Flurry (which is a very big contributor to enhancement shamans total physical dps) procs faster if your mainhand is faster. With a 3.80 attack speed, the three or four swings it might take you to get your first crit can take up to 10 seconds, but with a 2.1 attack speed, it takes considerably shorter. Now of course, a faster attack speed also wears out your Flurry charges faster, but the more crits it does evens it out. The painful part is before your first crit, when you're whacking away with no flurry charges at all.
Another advantage, particularly in PvP, is overkill. Do you really need that 2k windfury crit on someone if they only have 500 hp left? A faster attack speed lets you shred your opponent down when they're on low hp, instead of waiting in between each swing.
Finally, most theorycrafters very seldom takes into account the fact that all fights are not 1v1 where the two parties stand still and whack each other endlessly. Usually PvP consists of you running in, fighting for a couple of seconds, then running out, healing, running back in for a couple more seconds, etc. Especially when it comes to classes that try to kite you, or when you're changing targets after killing someone. If you fight for only 4.5 seconds, it's better to get off two hits with a weapon with an attack speed of 2.1, than one hit with a weapon with an attack speed of 3.8.
Now, I'm not saying fast two-handers are always better than slow two-handers, not at all. Those juicy stormstrike crits are a ton of fun, especially when they trigger windfury crits too :) But Enhancement Shamans are the only class on horde side that doesn't have to worry about attack speed. Slow weapons are good. Fast weapons are good too. Fast BoE Epics like Taran Icebreaker and Brain Hacker go for crazy low prices on the AH right now because half the server is playing a warrior, and slow two-handers are incredibly important for them. But for us Shamans, we can pick up Brain Hacker for 50g, and pass up on the Arcanite Reaper, which does the same DPS and only differs in attack speed, and is like 400-500g. This knowledge made playing my enhancement shaman a ton easier and more fun, so that's why I wanted to share it with you guys.