Saeviomagy
Adventurer
Even with prime strength, a basic attack is inferior to a power attack (and if it isn't, then there's something wrong with that power).
So this only really comes into play when only a basic attack is possible. That means AoOs and granted attacks.
Powers that grant attacks work as follows: the granter will never pick someone who's basic attack sucks to gain an extra basic attack. He'll pick someone in the party who has a good basic attack, and there is almost always one party member who does. If there are zero party members who do, he'll pick a different power. So you're not getting any gain here except a small amount of flexibility.
For AoOs, it's going to increase your ability to act like a defender. For a lot of non-defenders, that is a bad thing. To get serious mileage out of this, there's a lot more than a single feat investment that needs to be made.
So this only really comes into play when only a basic attack is possible. That means AoOs and granted attacks.
Powers that grant attacks work as follows: the granter will never pick someone who's basic attack sucks to gain an extra basic attack. He'll pick someone in the party who has a good basic attack, and there is almost always one party member who does. If there are zero party members who do, he'll pick a different power. So you're not getting any gain here except a small amount of flexibility.
For AoOs, it's going to increase your ability to act like a defender. For a lot of non-defenders, that is a bad thing. To get serious mileage out of this, there's a lot more than a single feat investment that needs to be made.