Barbarian tactics

Barbarians, as a class, are widely believed to be the best able to take down large targets, due to their Rage.

However, because of their lack of Feats relative to a Fighter and lack of spells relative to a Ranger or Paladin, they are not as adept at the many roles a combatant is forced to play.

Many Barbarian players see this as "the point" and gear their character towards their ultimate role of slaying the biggest and baddest of threats.

Class Advantages

Rage - You can fire off short term periods in which you gain enough Strength to hit better than a fighter and Constitution which lets you absorb damage like no other class. More HP - Even when a Barbarian is not in Rage, he has 2 more HP per level than a Fighter. This translates, at level 10, to 20 more HP. Improved Movement - With a 5% bonus to movement, a Barbarian is better able to respond to threats than other melee classes.

In short, a Barbarian is a mobile pain unit. So, that is your point, let's discuss how to use that to your advantage.

Closing the Gap on Dangerous Targets

Since you're a speedy class, you want to use that to your advantage. In terms of skills, you should consider Tumble. The reason for this is simple. If you are moving, you take a -4 hit to your Armor Class. Yet, as a Barbarian, you should be moving. Don't put yourself at unnecessary risk. Tumble to your target when you are surrounded by enemies.

If you'd like to become the ultimate force in moving in combat, you can try to get rear attacks for a +2 to hit. To do this, though, you need to keep mobile. The best way to do that is the feat chain Dodge, Mobility, Spring Attack.

If you're really kooky, consider Whirlwind Attack. You can tumble into a group of targets and whip out a dangerous attack against an entire group.

Consider Use of Two-Handed Weapons

Though they are often looked down upon in DDO because of the Damage reduction of Shields, you've got to keep in mind that as a Barbarian, you do not get the advantages from Damage reduction like a Fighter does. After all, your Barbarian Damage reduction does NOT stack with that acquired from the Shield. To add insult to injury, if you're a Warforged with Adamantite Armor the Damage reduction bonus doesn't stack there either! All it gets you is resistance against Adamantite weapons... since you see those so regularly.

And... the other thing is Damage reduction only helps with melee attacks. Elemental and spell damage is still taken in full. That means your principle threat is those spellcasters! And what better way to take them out than with two-handed weapons?

Two-handed weapons give you the advantage of adding in 1.5 times your Strength bonus. Since you'll have tons of Strength inherently and through Rage, this will let you smite spellcasters in only a couple swings.

If you'd like to make their lives even more difficult, consider feats that allow you disrupt spellcasting easily, such as Improved Trip or Sap. These feats, however, have a prerequisite of Combat Expertise so you'd have to have 13 Intelligence to pull this stunt. That said, it may seem like a waste, but Combat Expertise is widely heralded as one of the "uber powers" in DDO because it turns you into a defensive power in the click of a button.