Disclaimer: 10/10 => perfect product, not to be replaced. Ergo I don't give 10 with the exception of Software, as it's pure-Google Android.

Well, I bought the phone *after* the Galaxy Nexus' announcement. While the GN is superior in nearly all aspects, it's EUR 300 more and arrived a month later.
The Nexus S is a very nice phone, even though it doesn't have the best camera or a dual-core CPU. ICS runs flawless, the design is very smooth and the whole experience is very pleasant. It's way better than the HTC Desire I owned previously.
It should be noted that the back is prone to scratches and that various docking stations are available.

At a pricing point below EUR 240, this is an excellent choice.