I just posted something over in the Discussions forum... I'll cut & paste (my response would be buried in a link).
ps I don't recommend using Scouts to solve the Barb problem. They're best used to explore and pop goodie huts. A secondary benefit is that they help push back the Fog. However, to actually FIGHT the Barbs, yes, Warriors are better.
Here's my post:
Basically, the whole Barb "problem" can be boiled down to two waves.
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One wave is at the start of the game, when there are Animals and Warriors wandering around.
To combat this wave, you don't need a Barracks. A Barracks is an un-needed expenditure and is in fact counter-productive. Any Barb will always fight your adjacent unit, even if it's also adjacent to a wide open (ungarrisoned) city of yours. Simply fortifying a few of your Warriors on forested hillls will get them to 10 XP, which is the max you can get from Barbs. If you skip the Barracks, you can build an extra 3-4 Warriors. If you build a couple of Warriors that you would have anyway, plus the 3-4 from skipping the Barracks, that will give you 7-8 total.
In fact, I would leave ALL of your cities ungarrisoned. Send your Warriors and Scouts out into the wilderness. 7-8 units is easily enough to put a shell surrounding your borders, which will prevent spawning in a HUGE area.
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The second wave of Barbs is when they get Archers, followed by Axes, then Swords.
To fight this wave, you DO need a Barracks. However, by this time, you have an early-warning system of 10 Warriors, which will tell you immediately as soon as the first Barb Archer shows up. Your Warriors will each have 10XP or close to it. A Warrior with those skills should be able to beat a Barb Archer, no problem. Just leave your Warrior fortified in the hills, which is where you have had him most of the game so far.
The key here, though, is that it's time for you to start building a few better units. Axes/Archers/Chariots... they each take different tactics. e.g., your Archers you have to leave in the forests and let the Barbs attack YOU (just like you've been doing with your Warriors). Axes and Chariots you can be more aggressive.
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I have been playing a Huge games on Monarch since 1.52 came out and have had absolutely NO problem with Barbs. It hasn't even inconvenienced me, even when doing a builder strategy.
Wodan