I've stayed at all four moderates. The only time we've stayed at one during
free dining was last Fall and we were at PORS. The resort was great and did not seem too crowded. We were in building 18 (great location, by the way) so used the main bus stop. Also we just walked up to Boatwrights one morning (no ADR) and were seated immediately. I understand Boatwrights is no longer serving breakfast though. We loved the boat to DTD and how peacefull the resort was.
I've stayed at POFQ in May and Dec and it is by far my favorite mod. In fact I have another trip booked at POFQ for May 9th-16th and can't wait. I love how small the resort is, the boat to DTD, and how friendly the CMs are.
I've only stayed at CSR once (Dec 05?). The resort was beautiful and probably closest to a deluxe than the other three mods. Transportation and food court was also the best out of all the mods. We did not have a good trip though. My mom and I almost got ran over by one of those golf cart thingys (had to literally dive off the sidewalk, falling to our knees), the CMs there were the least friendly of any WDW we've ever been to, and we had a run in the some very loud, drunk conventioneers who were in the quiet pool every night. They were hitting on and really scared a couple of young 20 y/o ladies. Security had to be called after one of the drunks followed them back to their room. Saying all of that, I have decided to give CSR another chance and recently booked another trip there for Dec 12th-20th. The new room decor and queen size beds look really nice.
I've also stayed at CBR and that's probably the only resort I'd never stay at again. The room was filthy when I checked in, housekeeping just missed my room several days and I'd return at night to find my bed still unmade, the bus system was really bad, as was the food court. The final straw was when I returned late one night to find housekeeping had propped my door open with a trash can and then forgot about it. My room had been left open all day and evening. I was traveling solo and was scared to death when I returned to find it, so called security to go in with me to check everything out. They just blew it off and didn't seem to understand why I was upset.
