Peloponnes is a fairly quick civilisation building game. In it, you bid for buildings and terrain which increase your population and generate resources, while preparing for a series of catastrophes which can devastate your civilisation. At the end of the game there is a Knizian scoring where the lower of your two scores (total population vs. total VPs) is counted.
The card game is very similar to the original boardgame, and has all the same features and most of the mechanisms. In some respects the card game is better; it does away with the administration and accounting needed to manage your resources, grain, population and luxury items - instead, only luxury items are tracked, with everything else being managed by cards in your tableau and in hand.
Julian felt the catastrophes were more harsh in the card game than in the boardgame, and I think he's right. On the upside, not all catastrophes are guaranteed to hit in the card game (we didn't suffer an earthquake in our game) but when they do hit, they hit hard. I had forgotten how tough this game can be!
If you have the boardgame then there is no real need to get the card game as they are very similar. However if you don't have the original then I would definitely recommend the card game; it's fairly cheap and there is a lot of game in a small box.
Our game took about 90 minutes, which will be quicker with repeated plays, and I think everyone enjoyed it. I certainly did and can't wait to play again.
Final score: me 12 (won on a tie), Julian 12, Paul 10, Andrew 10, Hugh 8