I don't know if they're that attacking to be honest. Reid and Emerton/Dunn are very responsible and don't get exposed too often, while the wingers are free to join the attack quite a bit.
Contrast that to teams that give wingers and one of the central midfielders freedom to attack as much as they want and they aren't the most offensive team out there.
I'd call them a good balance between offense and defense, but not an out and out offensive team. If you watch their matches they're quite structured, they remind me quite a bit like Everton in their style of play.