Is it true Aaron Rodgers throws interceptions when he faces a good defense?

That is probably true but I think it is probably true with every quarterback. Of course they will throw more interceptions against good defenses than not so good defenses. I think Pittsburgh is going to be ready though and expect Polamalu to do some serious film study and take a risk here and there. That might equate to one interception or two at the most but not four...of course when you take a risk with a quarterback of Rodgers caliber it could also be a Packer touchdown if he misses!