I have been playing with PP for a while now and find that it works best when going up against single opponents in open areas.
I prefer DD when going up against multiple enemies as it’s so much easier to attack a few at a time while poisoning multiple enemies.
That being said, everyone has their own play style and what works for one person may not work for another. Combine that with the variables of traits and gear, its a bit hard to just deem that one weapon set is bad when it depends on so many different things.
Just my $0.02