Mouseferatu
Hero
I compared the armor as DR and defense bonuses in UA and Conan, and I gotta say, Conan's system is WAY better. Characters using finesse weapons (like a dagger, rapier, etc) can completely ignore the DR of armor if they roll high enough (a number above the required to hit roll of the attack equal to the DR of the armor), but barring vital area strikes reflected above, a dagger just ain't going to cut it against heavy armor. On the other hand, certain weapons have high armor piercing ratings (such as halberds, picks, etc) and can rip through armor by brute force. IMO, this is how it should be, and I'd LOVE to see 4.0 incorporate Mongoose's Conan armor as DR and dodge/parry based defense.
Now see, just as a purely personal preference, that's very much not what I'd want to see. I don't like having to worry about this weapon's armor piercing ability vs. that particular armor's defensive rating. I want to know to-hit and damage, and I want to know defense and damage reduction. Nothing more. Anything else, such as "weapon type vs. armor type," or anything along those lines, complicates what is already a more-than-sufficiently-complex system. Given the choice between realism vs. speed/ease of gameplay, I'll go with speed/ease of play any day.
Just IMO, of course, but I feel strongly enough about it that if D&D4 makes combat much more complex than it already is, I doubt I'd play it.