It was very useful in certain situations, but if I'm being honest... I would likely have been more deadly if I just went str build and chose the war cry legacy instead. I didn't want to be that same warrior, though, so I decided on STSF. I like different builds.
Now, having said that, I also had an int STSF warrior in Lexxi. Completely different spec choices, and it was more worthwhile as spear/mace.