As other's have mentioned, this is kind of a hard thing to gage. They are Bon Jovi... they have never been accused of being underproduced.

I feel like These Days has aged better than any other of their pre-crush albums...

But I think KTF has the best sound front to back. Every song on that album, I believe couldn't sound better (with exception of the siren in Fear). What other album could a song like IIWYM follow a song like BOR? From a production standpoint, I think that album is as close as flawless as an album can get, or a Bon Jovi album for that matter.

This now begs the question, what is their worst album from a production stand point?

Not inlcuding the first 2 records, I vote on Bounce. I'm not a big fan of Shanks since HAND, but Bounce was so uneven. Think about it. KTF had just as much diversity in songwriting, but it worked because of the even, thoughtful production. If they had produced Hook Me Up and Right Side of Wrong (or Joey vs Bounce) in a coordinated effort, I think album would have worked. It's weird because I thought the production for Crush was excellent.