Good to hear on the sales front. Actually, I don't think I've seen a well written review of EU3. (I think I've read all of 2 however). They give high marks, but rarely any real analysis. Gamespot in particular simply summarizes the game features, says its fun, slaps an 8 on there and calls it a day. The sort of lazy, incompetent style of review that infuriates me when they do it for films. (not least because their lazy 'summary' review tends to have spoilers)
That said, very few game review sites offer either well thought out or reliable reviews. (Gamespot is typically one of the better ones, which was the disappointing part about this one.) Most are simply too reliant upon the major game companies for their 'sneak peaks', access/insights, and advertising revenue. They will never bash a major release from a larger company. Some of the better sites will leave enough subtle criticism to allow you to read between the lines, but they'll always characterize that as a 'minor' issue and slap a high score on the game. They're no different than internet movie site shills.
And even the ones that try to don't really have the staff or time to fully play out enough of these games (tons to review) to give a fully informed review. Alot of times what you get, if honest, is merely a first impression. If the EU series didn't have a popular following a PI a really good reputation (aka, if this was the first game of the type and noone had previously heard of Paradox) I suspect you'd get alot more mediocre to negative reviews. Not because of any flaws in the game, but simply that it'd be too complex to get into on a cursory 'tryout' and there's no existing reputation to give the game the benefit of the doubt.