It's good. Earth Wand + Fire wand was an OP combination as Earth Wands applied oil surface and fire wand would set it on fire. Poison is better, fits in to Geomancer.
Poison is still flammable, literally nothing changed on that front and now if an enemy stands in water/steam, hitting them with a poison wand turns that into poison(also a recent change) as well, which is even stronger.
