I looked into this a while ago, and joined up on Find-A-Crew.
I think they have the largest share of the market, so it was a logical choice.
Skippers/Crew often post feedback on each other, but in my experience, you will only get positive reviews. People dont tend to write negative reviews, so you have to read between the lines, or make bad guesses by conspicuous absence of reviews.
FindACrew has a couple of free options, but gets expensive (in my humble opinion) quickly with prices between $75 USD for 30 days, up to $420 USD for a year.
Im also a member
on 3-4 sailing forums
(subscribe to) the relevant sections when Im in the market for a role. (Like now when Im looking for a cat for Wifey & I to help take up to the Pacific Islands from NZ). If you're serious about finding the best option for you, you'd be silly to limit yourself to a single
source, and thats why you'l see plenty of one-time-posters casting their net far & wide.
I've also developed a theory that people who advertise for crew fit into one of two categories. One of those categories is Skippers who aren't of the composition to keep crew, or acquire them through more personal means. The other category is obviously the Skippers who either want or need strangers due to various genuine reasons. I guess the same could be said for crew.
Multiple references should be offered and and checked by both parties.
When Wifey and I sail from Panama-Galapagos-Marquesas, I expect we will have to to fish
for crew and my net will cast as wide as practical.
I've seen a few 'crew wanted' type threads around here that are followed up by another CF member
"I have sailed with CaptnRon, and he's a good bloke, and pretty good at parking, yada yada yada"...
So, there is already some kind of adhoc thing going on. You could also use the personal profiles as a place to 'store' references from CF people, but you might as well just provide real life names & numbers.
That be my stream of consciousness on the topic.
edit: You're unlikely to see 'public' responses anyway because most transactions take place by PM in the first instance, and then quickly move to email