When I heard of SoE I was excited since I like a change of venue once in a while. My current campaign is based in the UK with excursions to Vienna, Rome and the Balkans.
Things that I liked: Matrix access ratings, border security ratings, political relations both within and between the various nations, and tips on running in each country. Having a bit more cultural discussion would have been nice (I actually still find myself referring to my London & Germany sourcebooks a lot), though I understand there is only so much you can put into a sourcebook that covers such a large area.
I also like the fact that some areas (such as the Balkans where much of the current campaign is focused) were left open. It's nice to have a few areas where a GM can be free to play with the local setting.
The things I didn't like were the maps which lacked scale and even minor detail (major roads, railways, etc). Also, it would have been nice to have maps of a few of the major cities such as Paris, Vienna, Rome, and Europort/Amsterdam. As I mentioned in another thread I ended up buying Michelin maps (online maps are nice but a chore to print if you need hardcopy) of the various areas the runners were travelling through to determine distances & travel times. Also, with Russia being a major player in the Euro Wars and Divided Poland, I was a bit surprised to see that there was no national profile included.
Overall I give it a B-