I was sceptical about travelling in a group, as I normally like to be more independent. However, I think for a country like Jordan, you really benefit from travelling in a group with a knowledgeable guide. There are so many layers of history in Jordan; if I had travelled on my own, my experience would not have been nearly so rich or fulfilling.
One thing about travelling in a group is that group dynamics take over. On this trip, it is possible to have almost every minute of every day occupied. If your idea of a holiday is to drift and chill out with the locals, I would not necessarily recommend a group holdiay. I was lucky: the group was great and I had a couple of days at either end of the holiday to do my own thing, which was totally possible as a single female traveller. Jordan is very safe, the people are lovely and there was none of the hard sell nor any pushing of the sexual boundaries that I have experienced/heard of in other Arab countries.