I love Say You Will. I agree with everyone who said it's their best and most interesting work since "Tusk." Not that that's saying much... "Mirage" and "Tango in the Night" are both pretty bland affairs overall despite a few good singles, and we won't even get into "Behind the Mask and "Time."
Stevie's work, in particular, is stellar. I love all her songs. Mick's right in the Destiny Rules doc when he says they're her best group of songs since the 1970s.
I still say "Illume" is amazing, aside from the vandalism that Lindsey Buckingham committed in adding those heinous computer voices. I think it's one of her most adventurous and unusual songs.
"Say You Will" is fun but suffers from a bad vocal and colorless production. Uh, the kids' voices? Maybe even worse than the computers.
Compared with Stevie's songs, Lindsey's to me seem mostly flavorless. He's never been as distinctive a songwriter, but to my ears only "Red Rover" and "Miranda" truly jump out of the speakers. "Bleed to Love Her" was great on The Dance but I HATE it here. Those echo-y drums ruin it.
"Come," meanwhile, is the album's one utter travesty.