Before the patch we could do roughly 166 DPS minimum to a single monster with a Flare rotation, which is 500 DPS for 3, 1660 for 10. Now We do roughly 100 DPS to a single monster with a Flare rotation, which is only 1000 for 10. Big loss in AoE DPS, while ST DPS took a hit as well. The thing that changed was the double fast-cast Fire spells when moving from Umbral Ice to Astral Fire. They fixed the bug so you only get 1 fast-cast Fire spell, which really lowered DPS significantly.

However, it isn't something to cry about. It was a bug that needed fixed. The problem most people have is they were so used to it because it was hard to avoid the bug. Now they see lower numbers and feel lackluster in comparison to what they're used to. I guess you could call it irrational.