I do not know much about Ohio Northern, and its probably a little late to help now. However, I can speak to Roger Williams.
Before I chose Pace, I was on the fast track to going to Roger Williams. I personally believe Pace was a better fit for me, but I had nothing against Roger Williams. They were friendly, helpful, and very receptive. I was not happy with my scholarship, and I asked for more, and they gave more too me. I loved the campus, and the people there were friendly. The students seemed upbeat, but that is tough to gather just from campus visits. I have read bad things as well, however, remember, this is the internet and anyone can post. Most of the claims have no facutal basis (someone said sucide rates were highest on earth or something rediculous). It sounds more like people who may not have had a solid idea of what being a lawyer was, got into Roger Williams and graduated not making 100K a year.
I can say that Roger Williams is a good school, should be on the rise, and the facility is in very good shape. Also, the town around it is a nice, small New England town with plenty of things to do, and is a fifteen minute ride to downtown Providence.
Hope this helped.