Tom, thanks for the chance to chime in.
I am a 46 year old, male, aviation enthusiast. My wife and kids do not share my passion (Mrs. Sandiego89 thinks a spitfire and hurricane look the same!

). I usually go to museums and collection on my own, and that gives me the time to spend on what I like.
I prefer aircraft, helo's and jets from the 1940 to modern period. Less interested in pre-WWII and absolutely no interest in general aviation or sport flying (pitts, extras, etc). Large civil props and jets, and trash haulers are of interest.
I also enjoy other historical sites: battlefields, industrial sites, military bases.
For other museums I like industrial type museums, science centers, etc, but enjoyed them more when my kids were younger.
So my likes:
- Large artifacts. Airplanes, helicopters, engines, vehicles, ships, weapons.
- unrestricted acces to aircraft on display. No I don't want to climb in them or on them, but I dislike ropes and fences. I like to walk around and under if I can. I understand the liabilty and damge concerns by careless visitors.
- Collections are fine. Collections are a museum.
- Dark and dusty preferred over squeaky clean. There is something magic about being in a place that feels you are in on a secret. Makes it seems like a working environment. My experinces at the Garber annex, Rhode Island and Chino are the best examples of this. The museum at Santa Monica was squeaky clean and made me feel like I was in some rich guys garage and was uninviting.
- quiet over loud
- Operational appearing aircraft. Oil stains, drips on the floor. Unrestored, or partial airframes are fine. I prefer flying aircraft, but I get not all should be or will be flown.
- Inside and outside display are fine. Boneyards are great (in the right climates)
- Open cockpit displays on occasion. Sit in a nose section, proceedures trainer.
- cut away displays of aircraft.
- major sub- componants on display- weapons, turrets, engines, ejection sets, etc.
- Some stuff you and the kids can touch.
Dislikes:
- aircraft hung from the rafters. Can't see them up there.
- ropes/barricades.
- period music.
- airshow announcers who don't shut up when a merlin is screaming by.
- Squeeky clean. Great for an art museum, not an aviation or industrial museum.
- docents who hound you. Yes I know they are passionate, but I sometimes know more than them. Not saying this in arrogance, I just sometimes don't need to be told some things. I know they are there if I want to talk.
Not too interested in:
- Simulator rides, IMAX, hands on stuff. Great for the kids, but I am passed that age.
- art
- small memrobelia. Flight related equipment and clothing is OK, but not too interested in year books, log books, china, swords, china, standard uniforms, etc.
Could care less about:
- Photography. I don't take photos so could care less about optimal lighting (I know some a VERY passionate about this, but you said you wanted bias!)
- re-enactors.
- life on the homefront stuff.
- interactive stuff. Again great for a science and industry museum.
Standing by for incoming!!!!!