best album of all time? Certainly
not. 
I do applaud the band for getting back together. At that time I was elated they were making another studio record. When I heard Christine was out... I was skeptical. I still like Say You Will, but it's so convoluted and... messy. I almost wish they had just released it as the 2-CD album it was originally envisioned. It's a hot mess, and I think they were attempting to do a Tusk Redux in some ways...but comes nowhere near the brilliance of Tusk.
I think Tango in the Night, Rumours, Tusk, The Dance, the White album, and possibly Mirage are all superior to Say You Will.