I am unaware of any review of Bart Ehrman's book that was done by Bruce Metzger, and in the last few years Metzger generally only has done brief book reviews for the back cover of books he has endorsed. On the other hand Ehrman quotes and references Metzger more than any other scholar in his book. To explore the interaction between Erhman and Metzger, you can start with Ehrman's references to Metzger.

I do know many other scholars who have concurred with me on appreciation of Ehrman's work, though virtually no scholar agrees with everything that any other scholar has concluded. You can look on the back covers of some of Ehrman's other books to see commendations by scholars like Elaine Pagels, Elizabeth A. Clark, Kerek Krueger, and Francis J. Moloney.

There are a few reviews of varying quality at amazon.com at:

http://www.amazon.com/exec/obidos/tg/detail/-/0195102797/qid=1108496629/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/102-5063420-0989703?v=glance&s=books&n=507846

See also:

http://www.google.com/search?hl=en&lr=&q=book+review+ehrman+bart+orthodox

(For future needs use the following syntax:)

http://www.google.com/search?hl=en&lr=&q=book+review+(author's last name)+(author's first name)+(significant word #1 from title)+(significant word #2 from title)

You also might explore some of the online biblical journals that I list and link at:

http://www.bibletexts.com/reviews/other-resources.htm

Of particular value is the SBL (Society of Biblical Literature) website feature of book reviews at:

http://www.bookreviews.org/search_now.asp

If I come across any other reviews in hardcopy biblical journals, I'll let you know.