Asylum ticks for 2/3s the power of your Regen though cannot be affected by healing boosting abilities like Defiance, Divine Seal, Fey Illumination, etc.

With that being said, I find Asylum to be highly potent. A free 800 potency cure over the course of 24 seconds to anyone who's within it is very useful. I do wish it had a bigger radius, but if placed properly, players can move appropriately while still remaining within the bubble. As some BLMs have mentioned, put your Ley Lines down, and sit on an edge of the circle. Then dodge to the other edge so you can still be within the Ley Lines. Asylum can work in the exact same way.

For me, Asylum is just another Divine Seal + Regen that's more bursty, since you're getting a 250 potency / tick per heal for 24 seconds with Asylum + Regen versus a 195 potency / tick heal that actually lasts approximately 36 seconds with Regen + Dive Seal.