Well I have seen worse rust. And for a 9 year old vehicle in the rust belt, it's not out of line. A lot of it comes down to your plan for the vehicle. The high (dollar) route is to get a rust free vehicle and keep after the undercarriage so it looks like it spent winters in LA.
However, that's easier said than done when it's cold, wet, and snowy and the DOT trucks are treating the roads like margarita glasses. More pressure to keep after the salt if you bring one up down south.
The other option is to wire brush what is there, paint it, treat it, and try to keep it looking half way decent. More work and/or money, but not impossible either. Since I'm in the rust belt as well that's the route I'm going. Keeping after the surface rust and trying to stop it from getting worse. As long as I'm in this part of the country there will be rust and I have to deal with it.
Of course you can also plan to keep the vehicle a shorter period of time and not worry about it - though if you're on here that's not very likely.
If it helps to have a reference, I posted some pics in another thread
about rust. This truck looks like it had more corrosion than the one you are posting about even though it's newer. (The kid I was helping passed on it, but because he thought "more girls would dig a Sun Fusion FJ than a white one")
I think you mentioned in another post you were looking at (or was it For?) a Sandstorm FJ. If you have a backup option, how does that one compare?
My question is, is this FJ worth it? Amount of time to do work on the rust + the other maintenance.
And can anyone please help me. Thanks!