How is THIS:

"An attacker that controls more than 50% of the network's computing power can, for the time that he is in control, exclude and modify the ordering of transactions. This allows him to:

Reverse transactions that he sends while he's in control. This has the potential to double-spend transactions that previously had already been seen in the block chain.

Prevent some or all transactions from gaining any confirmations

Prevent some or all other miners from mining any valid blocks"

And THIS :

"if this attack is successfully executed, it will be difficult or impossible to "untangle" the mess created -- any changes the attacker makes might become permanent."

not that bad??? Are you from Bizarro World?

*edit: No offence implied.