It takes time for everyone to gather around the tour guide for those words of wisdom. When every direction and description has to be repeated in two or three languages, time drags, especially if it's raining or you're eager to get in as much time as possible at a particular site. Also, if your language is in the minority, you may find your group getting short shrift.
Will the same tour leader stay with you throughout the trip or will you get local tour leaders in each town?
Most tours have one bus driver and one leader who accompany the group, which assures continuity. But a tour is often enhanced by the addition of local guides who are ultra-familiar with a specific cathedral, ruin, etc.
Are entrance fees included?
Entrance fees add up quickly, especially when you consider the weak dollar in some parts of the world. For example, if you visit two sites a day and the entrance fees are 4.5 euros each, or about $5.85, that can add more than $150 per week per couple. Also, if you run short on the local currency, it may not be convenient to get to a bank. Most sites in such countries as Italy and Greece only accept cash.
Are tips included?
While meals are included in many tours, tips are often extra. Before you go, see if tipping is customary in your destination. If so, it helps to have a good cache of the local currency to pass out (get smaller bills). Before the dollar's plunge, waiters, tour guides and others didn't mind being tipped in dollars, but that attitude has changed.
Are hotel transfers part of the deal?
It's unsettling to arrive in a strange city after a long flight and have to figure out how to travel from the airport to the hotel without getting ripped off. Make sure your tour operator plans to have someone meet the flight. If not, have a plan in place before you arrive.
If air is included, will the tour operator or travel agent obtain seat assignments?