Yes 18 seconds of damage that allows every trooper in your group in pvp at 30 meters to fire a HIB at the same target is terrible...
That would be sarcasm. The assault tree for Vanguards combined with a few points in Tactics allows you to hit like a truck, CC like no other, and retain the survival needed to live through things most of the other classes cannot. You are deadly at far, medium, and close range.
If you think otherwise you are not playing the class correctly. Have a nice day.