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There are some drawbacks with SSL security:
• Does not allow intermediaries access to SOAP messages.
All of the communication between the server is encrypted, which makes it impossible for
intermediaries to process any messages.
I understand the confusion. Transport security doesn't work out of the box for intermediate nodes. In order to make transport security work you have to create two ssl endpoins. An intermediate soap node has to interpret the soap message (otherwise it is not an intermediate node in terms of soap processing) so the node has to have a SSL endpoint and setup a new SSL connection with the next node(or ultimate destination). This makes the intermediate nodes unsafe.
In my version of the course the answer: "It reduces the performance as each message has to be signed and encrypted, and decrypted on the receiving node." is stated as correct answer but the explanation says "it's the other way round" (the answer beeing a disadvantage of Message Level Security instead).