This is a wonderful introductory medieval text. No introductory text can be all things to all people, but this one is still remarkable in its ability to address the most pressing issues. If Amazon allowed half stars I might have gone with 4 1/2 instead of 5, but it is closer to 5 stars than 4. The things that Rosenwein does VERY well include:
1) Chapter one is background on the Classical/Roman era to give students some perspective on the origin of the Middle Ages.
2) Inclusion of cultures beyond Western Europe is a huge plus. There is adequate coverage of events in Byzantium, the Islamic World, and later, of the Ottomans.
3) Includes excellent discussion of the art of the times. This includes the excellent, full page, high quality color pictures of relevent art and architecture.
4) A quality book overall. The maps are also often in full color, with a few in black in white.
5) A very readable academic style. The edge between being "unacademic" and being so scholarly as to be unaccessable is a fine one. Rosenwein sticks to it very well, seldom falling to either side.
There are, of course, areas of interest where I wish that she would go into more detail, but as other reviewers and commenters have noted, this IS an intro text, designed to be "short" and also it is aimed at the average undergrad who may not have a strong background in history. Professors constantly struggle with finding good quality books that students will actually read! A good professor will be able to adequately augment in the places where more depth is needed.
Overall, I would highly recommend this book for the classroom, and for anyone who is interested in a broad view of 1200 years of history, this is an enjoyable introduction, although if military/political history of only Western Europe (France, England, Germany, Italy) is your only interest, this may not be the book for you.