I think we all understand that this movie was never intended to be Oscar material.
And I have to admit, I'm not a big ABBA fan - I didn't recognize half of the songs in this movie, so it didn't mean much to me.
But it was much worse than I expected - the acting wasn't great, the singing was sometimes unbearable, and the storyline was ridiculous.
That being said - everyone was having so much fun making this movie it was hard not to get caught up in the enthusiasm. The actors clearly knew that this is just a bit of fluff, and that they are not great singers, so they just had fun with it.
It was quite refreshing to see people willing to make fools of themselves (and that they did!). We had some of the best actors in the world in this movie, and they just let loose and had a good time - I enjoyed that!
There were moments that were just painful, too - but they pass fairly quickly.
I've seen excellent movies that I could never bear to watch again (ie, Shindler's List) - this is the opposite - a terrible movie that I would see again in a heartbeat!
One hint - during the credits - GET UP AND DANCE!! Isn't that what you're there for?