This is an excellent general source. It is dated, so it is not going to pick up on current trends in thinking about classical mythology, but most of the shifts are subtle and/or specific, so Bulfinch isn't a bad way to consider the subject. It soars at 10,000 feet so the view of the specifics are hard to discern, but given its age, that's probably a good thing. I recommend that you enjoy it, but be prepared to follow up with additional research if you run into anything that you wish to pursue or that particularly intrigues you.