Ghost runs on a new engine and has some added gameplay features that I think really would make it worth $30. I play on ps3 and don't have any issues with it at all.
Dat exterior http://1.bp.blogspot.com/-qDdnwPOuokU/TxNMk4iUxFI/AAAAAAAAAoI/HyLL3sHS4jg/s200/clint-eastwood-disgusted-gif.gif (didn't know it was a gif until I went to copy link)