From my experience of EQ1 Warriors they only switched to 2H weapons when riposte was a serious problem. I've healed some very good ones at the top level and they used 2 x 1H.
So if that requires Steel Warrior to be wrong I'll go with that. Actually reading that thread it's just a list of aggro weapons - in no particular order. Just because it lists 2H first even the author of the thread said they were not ordered in any way. Most of the posters are even talking of the 1H weapons they are using. Why you think it justifies your comment about 2H aggro I have no idea - or was it just thrown in on the basis that a link is seldom read and using Steel Warrior to back up your unsupported opinion sounds good?
However that was at the top end of EQ1 and we're talking about the bottom end of EQ2 - Level 20!
In EQ1 you would not have found a level 20 warrior using anything but dual-wield because they had very little else to help maintain aggro.
EQ2 is very different. From a very early stage warrior types get aggro abilities that are way better than EQ1. The weapon isn't so important any more in aggro retention.
For what it's worth I've banked the halberd and gone back to shield and a nice axe. I can't find dual-wield weapons that make up for the combined loss of damage and defense.
It probably depends a lot on your regular grouping. If you are going to be soloing a lot then the extra defense is a must. If you group a lot then the kind of healer you group with will affect things. If they are using wards then you can go for offense perhaps more than if they are straight healing.
One of the differences between 1H and 2H weapons in EQ was the speed of the weapon with 1H typically being much faster. The argument about more damage less often is ignoring the aggro issue. In EQ - and we don't know how this translates to EQ2 but we can assume a similar line of thought from the designers - it was both frequency of hit and the amount of damage done that created aggro.
In EQ there was much made of weapon "procs" - magical effects that could randomly fire when the weapon was swung. Many of these could be used to increase aggro. And they were the only reason the 2H weapons on that link were high aggro. The more frequently they were swung the bigger the chance of aggro. I have yet to meet a proccing weapon in EQ2 except via weapon buffs like poison or the "Claws" racial trait offered to Kerra. So let's dismiss procs for the moment since they don't seem to be around at level 20 much and if they are buffs then they would apply to either weapon.
There are two issues of aggro in a fight.
One is the people who pull it off you by healing or nuking. There they may need help (or a rez) and you can taunt etc to pull it back.
The other is other melee who are generating more aggro than you. There you may have to talk to them about switching to slower weapons or announcing major attacks so you are ready to taunt. Also they may not have found a use yet for their aggro-loosing abilities and you can help them find it. In this situation a dual-wielding warrior will be challenged less since they are hitting just as fast as the scout class rather than letting the scout get in two or three hits for there one.
So I'd agree with the OP's rant. The Halberd isn't that great. If it's any consolation the other classes don't get much better. My shaman got a one-handed spear that animates like he thinks it's a fly-swatter and clerics get a lump of wood that looks suspiciouly like the one Captain Varlos gave them back on the Far Journey.