I'm going to put my 2 cents in as I've heard this argument before and I've played/play tabel top games. D&D and Runequest(I believe this is the name of the game, I've never played, but understand the concepts, it's Rune something anyways) are kind of the grandaddies of MMOs. Now, the important part is that whatever the name of that Rune game, it was based on skills unlike D&D which has levels, AC, spell resist etc. I'm going to jump forward a bit and talk about Shadow Run, which I'm more familiar with, and also is skill based, like the Rune game which brought it about.
If you have, or in the future play table top games, you should definitely try playing D&D and also Shadowrun. Now, I know D&D is more medieval fantasy, while Shadowrun is Cyberpunk/Fantasy, but if you look at just the "rules" I believe Shadowrun is a hell of a lot more fun. Usually, I prefer complete fantasy, but the rules in Shadowrun are what make it fun, and more of what I hope to see in MMOs in the future. Shadowrun makes it more like real life then D&D where everything is pre-defined and you only have pre-cast molds to choose from.
In Shadowrun if I wanted, I could create a character with lets say, all gambling skills. Bluffing, Poker, Black Jack etc. I could essentially create anything I want, anything you can do in the real world (and a lot that you can't) you can choose as a skill. In addition to this, everyone has the same (HP). In Shadowrun, there is no (HP) you don't gain more as your character increases in power. There are wounds, and usually armor doesn't make much of a difference... Wounds are the same for everyone, Light, Moderate, Serious, Deadly. 10 Light wounds would = Death doesn't matter even if you're a dragon (granted, wouldn't be easy to hit the dragon but...) I find this interesting b/c lets say I've been playing a character 2 years, and you're fairly new, and you've got me in the sights of your sniper rifle 2000 yards away, blam! You get really good rolls and my brain is mush. That's why I love Shadowrun...Now I will stop rambling...