Joan,
I stayed at the All Star Movies (ASMo) resort recently and had a very positive experience. The value resorts can be a little more informal and simple than the moderate resorts, but at the same time they have some of the best Disney themeing. As a Disney movie fan, I especially like the ASMo themeing.
If you want specific details about the ASMo room amenities, please read
this prior post. In general you will find the rooms smaller than the moderates (260 sq ft vs 314 sq ft), with slightly less furniture, but the bed sizes are the same (two double beds). It's definitely a "cozy" fit for a family of four.
Some amenities you won't find at a value resort, but are at
some moderate resorts: pool slide, business center, marina, fitness center, sit-down restaurant
Please be aware that check-in lines at the value resorts are often longer/slower, and sometimes large school groups use the value resorts and can make things a bit chaotic and/or noisy. I was at the All-Star Sports resort last December during Pop Warner (a very large high school group event) and didn't find it to be a problem, but I know there are others who have had significant issues with these large groups of kids.
Lastly, I really like that the All-Star resorts are not very spread out. Even if you are in one of the least convenient rooms, the walk to the main building is not very long. Several of the moderate resorts have much longer walks from the furthest rooms to the main buildings.
Hope that helps!