Why is seer the most broken character they have made?

@DreNH17Range of passive is too far.
Tactical does too many things and the cone of fire is to large. 8 seconds is way too long for his ultimate and the area of effect is too large.
His kit is too similar to others in general - tactical is a lot like Revenants and the ultimate is a lot like Bloodhounds. Stack him with others like BH, and you get a very difficult mix to counter. Diversity of squad mix will go down as a result