I have not heard of Steps of Paul cruises before. I checked their web site, and have a few comments:
I could not find prices for the cruise I looked at, so I have no idea whether their pricing is reasonable. Also, it seems that the shore excursions are all priced at $55. (I have traveled in both Greece by rental car, and in Turkey by bus (the Turkish buses are very good) to all of the places listed. Probably, the SofP operator is using local tour companies, so the quality of the guides, buses, etc could vary greatly.
I would personally travel by bus, or rent a car. Of course, on a cruise you unpack once, which can be a blessing.
Why not check out Gate 1 Travel? They have some interesting packages.
Please let me know if you get any more info about SofP.
Your thought is totally true, I completely agree with you. I really liked your post, interesting perspective. Even I was looking out for the same kind of information. Thanks a lot and hope to read more from all.