Diminished browser experience
It's practically impossible to use the web without JS enabled. Blackberry should just say use sites you trust or don't browse at all for all the difference this advice makes.
Research in Motion has suggested BlackBerry users disable JavaScript to protect themselves against a critical vulnerability that allows attackers to remotely execute malicious code and access confidential data stored on the phone. Monday's unusual recommendation came four days after contestants in an annual hacking competition …
I thought it was solved by ASLR in 4.3; meaning Apple's solution is better than RIM's. Also, I think the Android hacker informed Google before the contest and they plugged the Android hole, too. There are almost certainly cool, as-yet-unexploited bugs in both Android and iOS, but I'd agree that a Googasm or Fanboi is better off than a RIM user at the moment.