Yeah this is going to take a complete rethinking of what Rehgar's main focus should be and what he has available to him now. I think he's viable enough because his base heal is good now, but there's just no way to play him as active as he seems to be meant to be and be a real benefit to your team. The real hit isn't the range or damage nerfs on shield, it's the removal of the 2nd talent giving the duration increase. The whole flow is gone.
Seems like being boring might be viable, but it's not fun, and why bother when you could have a better specialized healer. Real bummer. I'm guessing totem + chain heal build is about it now because wolf build feels like junk also since they nerfed lunge last patch.
Xul basically seems like he can skip the first objective and push an entire lane in to the last gate before a Keep, and have your whole team up 10 to 8 before the 2nd objective pops. Add this to the fact that every game also still has a Li Ming in it, and QM solo queue just became unbearable again for the short term.