Enigma Machine is ok, but for me it's easily one of their weakest instrumentals (I'd say probably the weakest). It's not even the best instrumental on the album.
I enjoy it enough when listening to the album, but it's fairly simple riffing and soloing, and not too inspired to me. It doesn't have the buildup, the payoff, the melody, the beauty, the creativity etc that I enjoy from their other instrumentals.