Thinking of returning.

Been away from the POE community for a while, so wanting some opinions by people who post here of course. Trying to get a rough idea of everything that's changed, seeing as it's been 3-4 months since I've played. Passive Tree looks totally different, not sure if that's a good thing.. Scared about my duelist, since blood magic was the only way. However maybe something makes up for it? Don't know.. Give me your gripes, just so i can get an understanding. Oh and top 3 most valuable uniques in Standard? Thanks guys!