Kraydak said:So:
A) Careful Attack is an awful choice. Never take it. Never let a friend take it. It makes 3e's Dodge look good.
B) The removal of crit confirmation rolls means you have to be *very* careful comparing different abilities if you need something near a 20 to hit.
I at first thought that of course this can't be true, it doesn't intuitively seem like it could be. And then I did the math.
Taking a d8 for example, if you need a 19 to hit careful strike is going to give you a 15% chance of getting a d8 damage and a 5% chance of doing 8 damage, coming to an average of 1.075 per attack (since the average damage on a d8 is 4.5)
A twin strike has each attack unmodified, so each roll has a 5% chance of doing 4.5 damage and a 5% chance of doing 8. This comes out to .625 damage per roll, or 1.25 average damage. As mentioned, magic weapons will skew the numbers even more in favor of twin strike, and so the only time careful strike will ever be useful is when you need a 21 to hit, as then it will enable critting. Even then it's probably only worth it with a high crit or magic weapon that does extra dice on a crit (actually just did the math - twin strike is slightly [.05 HP per roll] better with a plain weapon at a 22 to hit). In all other cases it's an inferior choice.