I would read the official forums carefully.
On YouTube there are some good "Let's Play Empire Total War" videos by JosefVStalin that are quite good. I think he mentions the issues but is overall pleased with the game. Those are good videos.
JosefVStalin, for those who don't know about him, is quite a character (he really is a Stalinist!) and he does very good game videos, at least in my opinion.
Looking at some of that, I found myself liking the overworld, but thinking that the real time battles would get a bit repetitious after a while. Not to mention probably stretching my 4850.
Think I'll wait and see how Hearts of Iron III turns out. The demo might be out next week for HoI III. I think HoI III releases on August 7 still.