I have two ENTJ male friends and I have to say that I agree with your description, I think it's pretty accurate. I've never been afraid to be opinionated with an ENTJ since they rather enjoy it. I find them refreshing.....little ambiguity, no wasting time, and their Ni makes communication fairly easy.I like ENTJ, they are so easy to get along with - as long as you do not let them steamroll you into their way of thinking. They can be pretty overwhelming, so sure that theirs is the right way. And within 5 minutes they will have you convinced, too. Stand your ground and most of them will respect you, crumble, and they will walk right over you.
But you do not have to weigh every word in order not to hurt them and they will be very clear about their likes and dislikes, like an open book. I find this very relaxing, especially knowing how feelers like me can take everything intensely personally, so with other feelers there is a danger of dancing around each other, so as not to step on any toes. With an ENTJ it is more like a march - all toes out of the way and the direction is very clear. Just be carefull that you like where you are marched to.