At the moment slayer loses rampage for dual wield spec. That means Slayers with dual wield ID spec does not ignore parry/blok and are affected by enemy riposte which leads to "No more solo slayer movies" till it (if) gonna be reverted
Anyway You can still spec for Rampage for 2H spec, but dont expect so confortable 1v1ing because You lose 10% parry so not so much riposte procs, Your attacks will be much slower and You actualy need some crit chance to make 2H build worth.
Anyway playing slayer as a solo class is waste of his potential and I would pick other melee classes WL, WH, 2H WP(no idea how viable is he without .ab ex). Or tanks with IB on top who is best suited tank for soloing.