To be fair, Mosquera absolutely ripped the field to shreds on San Isidro, but that was from the front, dropping everybody except Contador and Levi, who then promptly nipped out from behind him in the last 200m to take the win.
And perhaps Mosquera's attacking reputation gets exaggerated because he (and Gesink) were the only GC guys to do ANYTHING aggressive last year. Mosquera was always the one to start hostilities. Maybe this year he's riding a bit smarter? He did say that on Monday he felt terrible right from the word go - but he still attacked in the last 2km when Nibali was struggling. It was him that brought the pain on Pal and on the Peña Cabarga, he was second to Samuel Sánchez on Lagunas de Neila in the Vuelta a Burgos, and was the initiator of the attack that started that fabulous battle royale between him, Contador, Antón and Soler in Castilla y León.
The guy has hardly been boring. He's not been Soler or anything, but he's brought a lot of interest to the race.