Hi Larry,
My wife and I are members of TWCC since Dec 2002, and did the St. Martin sail for the first time last June. Compared to the Grenadines (best) and BVI (next best), we also were disappointed by the St. Martin sail, but for other reasons than yours. We like sailing and long sails, and there just wasn't enough sailing for us. Due to flight screw-ups, we were actually picked up in St. Barts, so we did miss that long sail out.
I'm surprised that you were not told things. The crews we've had have always been very informative. Every evening after dinner, or morning after breakfast, we were shown maps and told what the daily itinerary was going to be. I thought this was standard. For instance, we were told that the cat HAS to take the 2pm bridge into the bay as the later bridge up-time (5pm) is too late to get to customs for clearance as the French side closes early. So we also sat on the cat on the Friday afternoon - what a waste that is, and a disappointment after a wonderful week.
The diving at the other bases is done off the boat, but at St. Martin was done by dive shops as the boats didn't have the gear. I did two 2-tank dives. The St. Martin base manager, Klaus, is himself a diver and he told me he was going to get the boats fitted out by the Fall, so I'm surprised/disappointed to hear that that's not happened yet. Hopefully still in the works.
As you didn't join I guess you won't get another opportunity to try TWCC out, but sounds like you're not used to sailing anyway as those cabins on the Marquises are HUGE compared to other boats I've been on. You are certainly right that it isn't for everyone, and anyone thinking of trying it out should seriously think about the "inconveniences" before going. It is self-selecting, and TWCC members all get along so well as we like that sort of thing. The trips I've done rate as some of the best vacations I've ever had in my life - which is why we joined.
AlanMJ