Olgar Shiverstone
Legend
The problem with multiplier crits in 3E was not only the additional roll (not a bad mechanic, just not as simple as it could be), but the massive additional modifiers. If you're rolling 1d8+4d6+57 damage, X2 on 12-20, crits are massive.
4E's max damage is much simpler, but not really that exciting, as you can still achieve that result rolling.
Personally, I'd suggest my old 1E house role: natural 20 means roll *double dice* for damage. So a longsword attack for 1d8 + 4 does 2d8 +4 on a natural 20 (2(W) in 4E terms). Simple, gives a feeling of getting more that you'd otherwise get, and isn't so much damage that it's game-breaking. About the only down side is if both dice come up 1s, but sometimes life is just like that.
Heck, if you want more damaging weapons, you can let some be additional dice -- 3(W) on a crit for big weapons.
4E's max damage is much simpler, but not really that exciting, as you can still achieve that result rolling.
Personally, I'd suggest my old 1E house role: natural 20 means roll *double dice* for damage. So a longsword attack for 1d8 + 4 does 2d8 +4 on a natural 20 (2(W) in 4E terms). Simple, gives a feeling of getting more that you'd otherwise get, and isn't so much damage that it's game-breaking. About the only down side is if both dice come up 1s, but sometimes life is just like that.
Heck, if you want more damaging weapons, you can let some be additional dice -- 3(W) on a crit for big weapons.