I bought this album a week after its release, I've already owned LD 50 and TEOATTC and seen them live twice before. You can say I'm a big Mudvayne fan...
I listened to this album in my car driving home. While the first few songs sounded really great, the rest of them started sounding alike so I would only listen to the first half and repeat the tracks. Then I bought another 2 albums(Audioslaves new one and Becks new one) and gave this album a rest.
After a week or two I came back and listened to Lost and Found again with a fresh take on it. I'd say almost every song on here is now officially a "greatest hit" It takes some getting used to, but this album is dare I say it...they're best to date.
In my opinion, I felt strongly about

Determined (brutal)
Happy
IMN (heaviest track)
Fall into Sleep (almost radio friendly)
Rain.Sun.Gone (almost radio friendly)
TV Radio (punkiest sound)
All that You Are(talented song to me)

Congratulations to the band members and I'll be back to buy your next album!