I've stayed at all levels of resort including Pop and AsMu. While we've determined the values aren't the best fit for us (we prefer the dining options at the deluxes), both resorts were clean, well staffed, creatively designed and totally Disney. We don't/won't stay in chain motels outside of Disney, but Disney doesn't put out a bad product at any level, imho. No resort is perfect, but Disney's bar is far, far higher than Motel 6. I think as a first timer staying on property you'll be pleasantly surprised.
We can't afford to stay deluxe or even mod every trip, but we'd never stay offsite. Once you experience the feeling of being totally immersed in Disney and separated from the real world, you'll be hooked regardless of the level.
Have fun!