You have in front of you the final and update and ultimate achievement of the Europa Universalis I/II formula.
You see, when in 2007 EU3 came out, it was... bad. I mean, REALLY bad. It was broken. Featureless. A big step back from EU2, that came out in 2001. The first big expansion of EU3 came out THREE MONTHS later. And even after another one in 2008 (when the game was repackaged under the "EU3 Complete" name) it was a disappointing game, coming after the historical flavour of EU2.
So in 2009, 8 years after EU2, the team behind the AGCEEP mod for EU2 released this "sidequel" to EU2: it had widescreen resolution, it had 10,000 historical events, it had major tweaks to the rules and the AI, it had a better, more streamlined UI, it had better mod support. It was, in that particular context, the "real" EU3 (more like a EU2.5).
So, it's a great grand strategy game. But.
But in 2010, EU3 saw the release of another TWO expansions, and the game became good at first, and excellent after the last one (now it was repackaged again under the "EU3 Chronicles" monicker). Yes, the historical flavour was still lacking compared to For The Glory, but in every other aspect, it was now a superior game.
So I still recommend For The Glory in 2014, when even Europa Universalis IV exists? Yes, even just for a trip into history of strategy gaming. If you want to try Europa UNiversalis I or II, skip those and get For The Glory instead.
(note: last patch is a 1.3 beta "23 February", available only in the Paradox Plaza; the last AGCEEP release it's the 1.59b4 with a hotfix. Both aren't included in the Steam release)