I wrote a fairly lengthy review back when the Campaign Guide came out. I detest the new Realms, but I do go into some detail on what the book has eaten. It's here:
A Rant and a Review: Forgotten Realms Campaign Guide « Worlds in a Handful of Dice
For a second opinion, there's Gnome Stew's review, which is positive:
4th Edition Forgotten Realms Campaign Guide Review: Big Changes, Good Book, Crappy Map - Gnome Stew, the Game Mastering Blog
There's only one thing that we agree on - the map is ugly and riddled with errors.
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