After posting its first season-to-season decline for its fourth-season finale, MTV’s juggernaut Jersey Shore‘s posted its first season-to-season premiere drop. Last night’s Season 5 opener was down 14% from the Season 4 debut. Still, it drew a massive audience of 7.6 million viewers and dominated the 10 PM hour in adults 18-49 on broadcast and cable. In persons 12-34, Jersey Shore posted a 7.2 rating.