Two things are have been made public that are relevant to his production in NO.
1 - New Orleans, according to another former DC, was trying to emulate the Seahawk defense without the appropriate personnel. Adding 1 ex-Seahawk just made them think they could pull it off, it made it worse.
2 - Browner was playing last year while injured.
Add both of those 2 together and you have a reasonable expectation that Browner is much more likely to produce than his results last year indicate. Combine that with his production on both the Seahawks and the Pats? The chances he delivers increase accordingly.
There is not a guarantee that he reverts to form, but it is by no means a long shot.
I like the odds and the positive impact he is going to have on this defense.
(I wish he would quit rubbing it in the Saints' faces a bit, on the 'take the millions and run' story, but it is pretty clear he was encouraged to play hurt and then used as the whipping post because of it. I would be pissed too.)