My point is that a lot of the complaints about the ball mention the ball's perceived lack of weight as a factor but the Jabulani is towards the upper end of FIFA's specified weight, so I think if there is a problem it lies elsewhere.
Some players have indeed had issues with the ball, but I wouldn't say it's the weight it may be something to do with the materials, some element of the construction, perhaps the reduced amount of exposed seams causing the flight to be unpredictable. I don't know, but players regularly use balls of similar or even lighter weight without complaint.
For what it's worth, I too had the chance to have a bit of a kick around with a Jabulani the weekend before last and my experience with the ball wasn't too far away from what you're describing. Every deft pass went astray, every carefully placed shot flew well wide. However, this is what happens every time I kick
any ball so I wasn't that surprised.