It isn't. But (due disclosure: I worked at Intuit once and while I have no special knowledge about this deal, I know how Intuit works)
Intuit had no choice really. Mint was high on management's radar and they were always scared of it. Intuit doesn't "get" the web, the whole company is structured around its success on the desktop and there are too many layers of management to make any kind of innovation successful (One on team I saw, there were 22 managers and 3 developers! I kid you not!).
Intuit talks a lot about "innovation", but the fact is that Mint (and FreshBooks) have been chipping away marketshare every quarter and they couldn't build a mint clone/mint killer (they tried a few times).
Intuit has no choice but to acquire mint if they wanted to have a solid web offering. Will they run it into the ground? certainly, over time, as soon as the mint devs vest and leave and the regular Intuit folks take over. Of course this leaves the space open for another competitor!
Congratulations to the mint team! The one thing Intuit has in plenty (for now ;-)) is money! Enjoy!
EDIT: If I were Intuit and I wanted to make this work, I'd keep the Mint.com team around and let them work in their own fashion, outside the regular Intuit corporate structure. Knowing Intuit this will never happen.