QUOTE (sabs @ Jul 14 2011, 02:29 AM)

Most people don't play Mr Lucky.
They play MR 3-4 edge.
Who is also an incredibly good hacker with a DP of 16. Or a GunSlinger with a DP of 18.
With guys like that, you have 2 situations.
1) I'm rolling for 6-7 hits. On average I get them, and that's not worth spending an extra edge on before I roll.
2) I'm rolling for 10+ hits, and I really need the exploding 6's.. so I already spent my edge.
But also that guy does other rolls.
- They decide to roll their mighty influence skills: Charisma 2, Skill 2
- They might decide to sneak past the guards: Agility 5, Skill 1
- They might want to repair their car: Logic 2, Skill -1
- They need to recognize that gang insignia: Intuition 4, Skill -1
So if you are already very good at something, rerolling failed die rocks. If you are not good at something, rolling the edge extra die and exploding 6s is really good.
Personally I like the edge mechanism: I use it to separate the PCs from the mooks. In my games NPCs hardly ever spend edge. I like it that edge is effective: in most games the "Luck" mechanism really sucks.
Example: Witchcraft. With luck 3 (costs you 30% of your quality points) you can once per session add 3 to a d10. Yawn....I am falling asleep already.
QUOTE
I don't recall Earthdawn all that well, so I can't comment on that. I can say that I've seen firsthand many ways that a high Edge can unbalance the game. It's the power curve that does it: not only can you use it more often, but it gives you more dice each time. It'd be more balanced if it gave a flat rate of return.
I've played a character with edge 6, and enjoyed it. However my highest unedged die roll was 12 die, and the more common was 6 to 8. The Hacker was rolling an unedged 17 die, the street samuari an unedged 15. So spending my edge got me to the same levels as they did... Having played a range (from 1 edge with badluck, to 6 edge), I can conclude that edge is an attribute that is less valuable than reactions or intuition, about the same value as body, but probably more generally useful than charisma, strength or agility. YMMV.