I do it all the time, and I treat her as I would when I play Janna, all you have is CC and a shield, no healing (other than Janna's ult, but using that just for the heal isn't going to get you very far.)
I play with 0 AP, until I get Kage's then whatever I turn that into. As long as you can max her Shield first, it is amazing at early levels, and even late with a tiny bit of AP, you can make some good saves, you're going to want very high CDR, max it out if you can, which isn't hard. Having Athene's with whatever you turn Kage's into, will give you around 100 AP, and the Chalice is a must, she OOMs very fast.
When I support Ori, we are almost immune to ganks, with her shield and the speed boost, which turns into a slow when enemies walk over it, it makes it very hard for the jungler to catch us.
The good thing about her shield is that you can just stick it on your carry, and leave it with them, and they can enjoy that bonus AR and MR, plus since the Ball is already on them, you can shield them a lot faster, rather than waiting for the Ball to move to them.
I just like Ori in general, and it feels great when your running away from a losing fight, and you throw your Ball back, just to ult right at the perfect time pulling the entire enemy team in, keeping them inside of a GP ult lol