Issue – Ignoring class HD & Level differences
[sblock]This is simply not true. A 6-th level barbarian would have 6 base defense, and with these arrays probably at least +1 from dexterity. Also, he would have a soak value of somewhere around 6 (+4 from chain shirt, +2 from Con) supposing he hasn't taken Toughness. When raging, he'd have a soak of 8 due to con bonus.
A first level wizard would have a defense of maybe 1 (+1 dexterity), and a soak of 1 from con. If he has cast Magic Armor, he'd have a soak of 5.
If someone attacked these and rolled for example 20 on the attack roll, and dealt a base damage of 1d8+5 damage (average 9), they situation would be:
For barbarian: Supposing average defense roll, he'd take 9 damage +3 from attack bonus difference. 12 damage would be reduced to 6 after the soak, and to 4 if he raged.
For wizard: Supposing average defense roll, he'd take 9 damage +9 from attack bonus difference. 18 damage would be reduced to 17 from soak, or 13 if mage armor was up. He'd take more than double the damage of the barbarian regardless.
A situation much more like the one you describe would be the difference between for example a barbarian and a rogue, since a 6-th level rogue might have slightly higher defense (5 base defense +3 from dexterity) than a barbarian. Still, the soak would probably be lower due to lower con and lighter armor. And also, different feat choices. And also - equipment becomes more important. A barbarian might have to give up the versatility of light armor for maybe a breast plate, and might even consider carrying a shield.
So the differences in survivability is tied to BAB, Reflex, and Constitution instead of hit points - the two first vary between classes and levels, the last one should be high priority for anyone who wants to stand in the middle of a battlefield. It increases (compared to the other classes) survivability of classes with low attack bonus and high reflex saves - the rogue and monk only, in this case (or if the swashbuckler maybe have average BAB). Neither of these are excactly over-powered in combat as it is.[/sblock]
Issue – Too many rolls for a PBP game
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[sblock]Yes, I can see this being a problem. One option might be to let me do all the responsive rolls such as defense rolls and saves, while the players get to do their attack rolls and such. I don't want to deprive the players of the fun in rolling dice, and I do trust you - it's not a competition anyway. That it's not a competition might be a reason too that I just care about decent balance - everyone should have their moment of glory, but having numerical balance all the way to the tables seems quite unnecessary. The fighter will be the best at fighting, the rogue will be the best at sneaking, and so on. This won't change.
Non-random defense isn't too good though, it takes away the whole randomness and danger of combat. Because of soak, having random defense is a key variable in being able to deal decent damage at all.[/sblock]
@Doghead: I though about using 2d10, but I'm gonna start about the same campaign as a table-top game too and thought that I'd do different methods at each version of it to see what difference it makes.
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Updated the top post with some more info, especially two character classes to allow for different builds than just different kinds of fighters and different kinds of rogues.