There probably are plenty of situations when 20 feet of movement is simply not idea.
However, the issue I expect to see is that the bonus to damage and AC is so appealing that scout players will constantly try to avail themselves of it at every opportunity, even to the point that they sit and try to finagle it constantly, well past the point where they should realize it's not gonna happen this time.
Honestly, the feat should have had some prereqs that would have made a player work for its benefits.
However, the issue I expect to see is that the bonus to damage and AC is so appealing that scout players will constantly try to avail themselves of it at every opportunity, even to the point that they sit and try to finagle it constantly, well past the point where they should realize it's not gonna happen this time.
Honestly, the feat should have had some prereqs that would have made a player work for its benefits.