No, not broken.
A few updates ago, the double ring, up to 10 meters in diameter, was changed to a single ring and 5 meters in diameter. The problem solved was agrowing mobs from too far away, and on other sides of walls, plus to reduce RoF effect induced lag. It still provides massive BPE debuffs (-276,000 BPE), at max level and 102,175 to 145,965 fire damage on application, and 156,669 fire damage to up to 8 targets, in a 5 meter area, afterwards. (New LI, with Ring of Fire Damage Tracery (Teal, 460, +50% damage) and Area Effect Target Count Tracery (Teal, 460, +3 targets)). I use it frequently.
Ujest - 140 Lore-master, Opun Tia – 107 Warden, Tummi - 105 Captain, Veneur - 75 Hunter, Cneasai - 66 Minstrel, plus alts and mules
Officer, Pipeweed and Ale, Arkenstone (formerly – Friends of Frodo, Vilya)
and Star Citizen…