The AS depends on the family, number in the room and what you think of them in the first place.

So far we have stayed at CSR, POR, ASMu (2x) and ASMo. (2 adults)
Like someone else replied, for the $ the AS is hard to beat.
There's no in room coffee maker. Which let's face, doesn't make good coffee anyway.
No ceiling fan.
The laundry facilities are small, considering the size of the resorts and how many families stay there.
No slides at the pools.
Smaller sink area.
But the CM's are great. The best we have experienced yet at WDW resorts.
Very good, organized bus service.
Clean, well maintained grounds.
Less expensive food court. (But the food isn't as good either.) Fair selection. Again not as good as the mods.
On our first AS stay, we weren't expecting a lot and were very pleasantly surprised.
So far 3 out of 3 AS stays have been great for us. We wouldn't hesitate to stay again.
Which AS you prefer just depends on theming. They are very interchangeable resorts.
One thing we did notice at our last ASMu stay, the main behind-the-scenes AS bus area is between ASSp and ASMu. Anyone staying near/overlooking the bus area would probably not be too happy, I have a feeling.

(Noisy)
We have stayed in the preferred view in ASMu and regular. Preferred was handy. And although we faced the pool, the pool noise did not come through into the room.
I would ask for a top floor. The AS have turbo tiolets.
Two stays we were on the top (3rd) floor and the noise level was not bad at all. Very good actually.
One time we were on the second floor, during a busy weekend. The water noises (tiolets, sinks) was much more noticeable.
More than two persons per room, I would think feels too crowded. But guess it depends on what you are use to in the first place.
