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A crit maximizes all of your weapon damage roll. In other words, you do 12 + modifiers there.

In general, Brutal Scoundrels seem to be better served by taking a rapier and a PP other than Daggermaster (Plus Light Blade Mastery, of course), while artful dodgers are pretty pidgeonholed into daggermaster to increase their threat range.

Most magic weapons do gobs of extra damage on a crit (often +1d6 per plus of the weapon), so it's fairly important.

I believe Daggermaster pays off handsomely for ADs.
LBMastery makes it much less sure for Brutes but remember that LBM comes along 10 whole levels later.

Couple of important factors:
- every magic weapon deals extra dice on a crit
- dagger master can increase daggers to d6 (some of the time)

EDIT: the best effect Brutal Scoundrel gives you is +Str to damage on your sneak attack!

Alright, the math works out like this:

Let's say that you hit with a rapier on a roll of 11 or better, and thus with a dagger on a roll of 10 or better. Your critical hit range with a dagger is 18-20 and your critical hit range with a rapier is just 20. The hitting on an 11 and 10 is done for every trial, regardless of magical bonus to the weapon. Assume that your targets AC scales likewise.

Dagger:
45% = 0
40% = 2.5 AD
15% = 4
Total = 1.6 ADPR

Rapier:
50% = 0
45% = 4.5 AD
5% = 8
Total = 2.425 ADPR

It seems obvious that a rapier is the better choice, but this is misleading. Take a look at what happens when you use a magical +6 dagger and a magical +6 rapier (no special bonuses on critical hits other than the standard +1d6 per plus).

Dagger:
45% = 0
40% = 8.5 AD
15% = 31 AD
Total = 8.05 ADPR

Rapier:
50% = 0
45% = 10.5 AD
5% = 35 AD
Total = 6.475 ADPR

Well, obviously by this level the dagger is better. This is with just a regular magic dagger, we could throw in a vicious comparison (+1d12 on a crit per plus), but you should be able to tell where that one goes.

Now let's consider +6 weapons when the rapier user has light blade master (crits on a 19 or 20)

Dagger:
45% = 0
40% = 8.5 AD
15% = 31 AD
Total = 8.05 ADPR

Rapier:
50% = 0
40% = 10.5 AD
10% = 35 AD
Total = 7.7 ADPR

Even with light blade mastery the dagger comes out on top here, not to mention that by taking light blade mastery and the rapier that you've burned through two feats. Plus the dagger can be thrown at a range of 5/10 when necessary and any magical dagger will return on its own at the end of the attack.

Daggers sure sound pretty nice right about now.

Then again, we weren't being fair again. We only compared the two at no magical bonuses and at +6. I'm sure you're wondering where the cutoff of where the dagger becomes better than the rapier is. Well without light blade mastery the two are just about even at a +2 weapon:

+2 Dagger:
45% = 0
40% = 4.5 AD
15% = 13 AD
Total = 3.75 ADPR

+2 Rapier:
50% = 0
45% = 6.5 AD
5% = 17 AD
Total = 3.775 ADPR

Here the rapier is better on average by .025 average damage per round. The dagger can still be thrown.

The thing is, you won't be getting weapon mastery until you get +5 weapons, so how does a +5 rapier with light blade mastery stack up against a +5 dagger?

Dagger:
45% = 0
40% = 7.5 AD
15% = 26.5 AD
Total = 6.975 ADPR

Rapier:
50% = 0
40% = 9.5 AD
10% = 30.5 AD
Total = 6.85 ADPR

The dagger is slightly better, and you have both feats still.

Remember, all of that was done with standard +1d6 on critical hit weapons. If you get your hands on a +1d8 weapon or a +1d12 on per plus on a critical hit weapon, the dagger outshines the rapier even more.

Throw in synergies with critical hit effects such as epic resurgence, symbol of victory, various powers like Crescendo of Violence, etc. and the fact that you can throw a dagger and I'd prefer to be a dagger wielder myself.

If and only if you really do take the Daggermaster path.

Between the X[w] attacks and the other paragon paths, a case can be made for Rapier over Dagger.