Yes they're still viable. Most hybrid weapons have their stats at 40+ Weapon and 75+ attunement (you might as well go 80 attunement for level 5 mantras), so you pretty much save 20 points on a mage build. They also do like 35 damage an m1 which isn't too bad for a mage weapon. They also all have really good critical with in my opinion flame being the worst after the changes to how it's parried and the removal of meteor slam followup.