Hi Dave. I do own at MFV. Hopefully I can answer all your questions you've posted.
As stated previously, the units are all 2-bedroom fixed units. I have always received an AC when depositing to II. When I've called to ask what weeks would get an AC, I've been told any Platinum week will do.
Maintenance has not been a problem that I have seen. The management seems to be on top of that. They even started changing the hardwood kitchen areas to carpet because visitors were complaining that they could hear every footstep from the unit above theirs. I believe they carpeted over the hardwood. The newest existing building didn't have hardwood to start with and the new one being built now will not have hardwood. The maintenance staff is very responsive while you are there. I called one night at about 10pm because I heard what sounded like a dripping coming from the unit above me. They showed up within 10 minutes. It ended up being the bulb in the foyer ticks when it warms up.

I've not heard of any risk of losing Marriott status. The new building that is going up now leads me to believe they are doing well with Marriott.
When we were there last year, we drove to Brigantine beach. It was very nice and large beach. It was about a 15 minute drive. The casino's were also only about 15 minutes for us. We didn't go to Great Adventure, so I can't answer that. Philadelphia was 45 minutes (MFV to parking garage in the city).
A Platinum MFV just sold on eBay last week for $8100. The seller seemed a little sketchy, but hopefully it was all legit. I've talked to others that have purchased around $8500 and up to $10,000.
If you're into golf and the Faldo Institute is one of your likings for this resort, forget about that. It's no longer there, but there is another golf institute there. I've recently still seen Faldo Institute advertised as a benefit to MFV. As mentioned, there is an Elizabeth Arden Red Door Spa. My wife really enjoys that. It has always been quite busy.
Regarding trading, I don't own Manor Club, so I can't compare. But, I've never had a problem trading to where I wanted to go with my MFV week. It has been a great purchase for us.
One of the things that we've enjoyed at MFV is the adult only pool area. It is behind the spa. They say its a mineral pool. Not exactly sure what that means. It feels just the same as the other pool to me. There is also a hot tub there. It's the pool you see in the MFV images with the tiny waterfall, which is where the pool drops down to another level and the hot tub.