I checked my regen stats in last nights 25 man:
~40% was from illumination
~25% was from replenishment
~ 5% was from mp5
So the patch will reduce the effectiveness of illumination by half, replenishment by 20%, but increase mp5 by 25%. That means:
20% loss from illumination
5% loss from replenishment
1% gain from mp5
net loss: 24%
We also lost 5% intellect from Divine Intellect.
In exchange, Beacon now counts overhealing. I don't want to downplay how massive a change that is, but i hope everyone understands that without the ability to spam Holy Light, the beacon change will be only situationally relevant. (ie situations where you have mana to burn)
Conclusions:
1. if you don't think this was a nerf, please re-examine the numbers - it was.
2. If you're planning on stacking mp5 to make up for lost regen, it won't.
3. If you're thinking that 51/20/0 is now somehow more viable because our regen is lower, I guess I'd just like someone to explain that to me. If regen is now an issue, how would a less mana-efficient spec now be more viable?
edit: L2type nub