Korver is a good kick-out guy for Rose. They needed a PF, and Boozer isn't a bad one.
I'd say they picked up pretty good players to round out their team.
Brewer is also a guy who can have an impact off the bench.
From where the Bulls were, these were decent pick-ups. It's just that based on where the Jazz were and how they wanted to spend their money, it made sense to let these guys go rather than extend them.