Interesting evaluation Ernie, thanks for the review.
We did the A4F last year (Salida), did two Chili Challenges (Las Cruces), four Jeep Jamborees (Palo Duro & Texas Spur), ran trails in Moab with some of the Rubicon Owner's Forum guys and have been on a bunch of rides with our club in Montrose. We will be doing our first FMCA gig at Thanksgiving.
Trail ratings are a tricky thing. Assigning one number doesn't help very much - some trails are fairly easy with maybe one or two hard obstacles (some with/without bypasses.) Some trails are a challenge for an experienced driver and well built rig for almost the entire length. The other aspect is an easy trail for me might be difficult for an inexperienced driver and/or driving a stock or mostly stock vehicle. As my experience level increases (and Rubi gets built up), trails get easier and easier - I'm not bragging, it's just an observation.
Now the guys with buggies (or truggies) on 40+" tires - they have to keep looking for harder and harder trails to run in order to have a challenge.
I agree with your A4F assessment - it's a young crowd with a lot of energy and involved in activities we're not interested in any longer. A trail that is fun AND one that has a good trail leader (and not too many vehicles) makes for a great day. We've had some excellent trail leaders and then we've had a few duds (I'm talking about the Chili Challenge and the A4F), on the other hand we've had very good trail leaders across the board at the Jamborees and with our club in Montrose.
Speaking of the Jamborees, that's a younger crowd like the A4F - sometimes I feel like I'm the Ancient Mariner

.
At the A4F last year, there was only one trail that I really liked - Chinaman Gulch.
Have a look at the trail rating system Trail Damage uses - they give a low end and a high end rating with several other attributes. Chinaman Gulch was a challenge and we did every optional obstacle. The other trails were mostly sight-seeing trips (which is okay, we like easy trails also.)
Moab - something for everybody, mild to wild and everything in-between (with amazing scenery.) I think we'll head there after we leave the Montrose area after Labor Day.