It's always a good one to use when bowlers aren't good enough to get wickets: "he takes wickets at the other end".
Unless you can take wickets in your own right, you aren't good enough.
Murali - fingerspin?
Fingerspin hasn't been revolutionised (Saqlain and Harbhajan, with their Doosra, were merely resurrecting an old art - Eripalli Prasanna bowled the same ball 30 years previously), it's just had a new trick well-publicised. And that new trick doesn't make the style into something that's somehow more bowlable than it was 10 years ago. Fingerspinners (Doosra-bowlers included) still need help from the pitch (as demonstrated by Saqlain and Harbhajan's records on helpful and unhelpful surfaces) and there are no more regular fingerspin-friendly pitches in Australia now than there were in 1954.
So therefore it's pretty logical to deduce that Cullen's unlikely to have much of a career.