Just watched the DVD of this 2002 Simon Boccanegra with Claudio Abbado conducting, Karita Mattila as Amelia, and Carlo Guelfi as SB. While he's maybe not my favorite ever, its a very lovely sound and there's no hint of the pitch/stamina/take your pick mess on display at the recent Rigolettos. Did he really go from solid to oh-man-this-is-kinda-upsetting in four years?
P.S. Mattila kicks ass here.