Oasis active is much better than most, especially for a free site.
It suffer's major problems because of the commonality of the people frequenting the site.
One must always, always, be alert for scams, fakers and floosies (unless you like that sort of thing) whether in real life or on the net.
Can't blame the site too much when it's free, as obviously they can't afford staff to vet everything. It can only give RSVP et al some healthy competition and encourage them to be more fair with fee structures.
To me Oasis wasn't free, because my time is valuable, and I'd rather spend it meeting someone over coffee at a cafe than waste my time reading thru useless messages.
I just discovered Oasis and ended up here while searching around for what people have been saying about it.
I joined to find a potential partner but decided that it didn't really work in that way.