So it's you, who's likely never seen one of these balls, vs a load of pro footballers who are trying to play with it day in day out.
Hmm.. who to listen to... toughie that one...
There's no need to be like that.
I'm just going by the following.
1. The ball is no lighter than any previous modern football.
2. As far as I can see the ball doesn't move strangely.
3. I'm ignoring what goalkeepers say because they ALWAYS complain about the ball. A trawl back through the BBC archives shows this.
4. The Jabulani was used in the last African Nations Cup, plus professional leagues for the last 6 months (Germany, United States, South Africa, and Argentina) with no major complaints.
All of a sudden now it's being described as 'a disaster' and 'the worst ever'. Just doesn't add up to me. As you point out, it's pro footballers making these comments, so why do they think it's lighter? Given that most of the complaints are about the ball's behaviour in the air I think the altitude has a lot to do with it. I think when it comes to long balls, crosses, and shots etc. the ball is just moving that bit faster which makes it difficult for players to judge the flight, leading to mistakes.
Anyway these are merely my thoughts. Don't lose any sleep over them.