I stayed at the RI Hughes Center and found it to be just fine. I used to stay at the FF Inn on Paradise using points because it was so cheap --15,000 point for 3 nights (alas, no more).
BTW, I believe if you have an Entertaiment card you can get both the Mariott suites and the RI at 50% off. I paid 59.50 per night at the RI on the weekend, got points, and it counted towards the free weekend night promo. At the RI you only get 5 for every $ instead of 10.
You will need a rental car or cabs though.