I think it's safe to say you do not like the book/ Priest's writing. Seems you enjoy the "traditional" Deathstroke as against the "layered" one Priest is offering. Maybe check out the New52 volume. From what I remember that had "guns and action". Think there was also one after that where he was de-aged...I forget now.
While the point on/concept of family has been a running theme through Priest's run on the book, I must admit that it has gone on too long (IMO) and he needs to switch it up. Maybe as you said, focusing more on contracts for example.
Boring is definitely not a word I'd use to describe his run...I will however say it becomes repetitive in some regard. Nevertheless, liking what Priest is bringing to the table.