Did you at least try on higher difficulties? If you were up there on a high difficulty with tough opponents, I will bow to your superior opinions since I play on medium at most (and I've never seen the AI show that sort of true brilliance either, but it can be a real pain in the ass nonetheless and I'll believe it's possible).
Can only second that opinion... if not playing on "intelligent" the AI is handicapped in the actions it can take.
(There s that hilarious screenshot floating around where the AI sends you a message complaining that "it can see what you are doing and it knows you are amassing a fleet to attack its empire and is outraged by it and if its admirals weren t complete morons it would do something about it.

)
Also... anyone calling GalCiv2s AI "bad" has to realize the following (and as highhanded as it sounds, this is really the only way to approach the matter, since it really is that obvious if you spent enough time with the game):
- GalCiv2s AI is - by far - the best that the genre has to offer.
- contrary to pretty much every other game... GalCiv2 AI's, on intelligent, does NOT cheat and is subject to the same rules as the player is.
- AI quality does not necessarily equal difficulty (an AI damage or ressource multiplier can do that as well) ... It does equal replay value however.
(This point is especially relevant when comparing GalCiv to games that feature moronic AI that can only put up a fight at all by cheating left and right.)
- the more you keep playing the more you will appreciate it.
As far as other (somewhat recent - for the genre anyways) games go...
Sins... Supreme Commander in Space: cool.... but, as already NGTM-1R already said, lacking in character - it's simply too bland.
SEIV... uhm... let's not mention that pile of *** again... worst AI in this list by far and zero replayability - in comparison anyways.
Sots... isn't as bland as Sins... and is worth playing... because it has multiplayer - other than that, not so much. Worth mentioning: Gimmicky and really badly thought out (balance wise) real time part allows for hilarious exploits against the very predictable and monotonous AI... /snooze.
Honorary Mention: Star Ruler... a gem in the making? Plays like a pre-alpha still.
What do 4x games have to add to a PC vs. consoles thread? Well. That is simple. Consoles suck because they don't have any 4x games worth mentioning - if they have any at all. :-) :-) :-)