Yes, I think the PS3 browser is far from great. I heard rumours of FF being considered.
I don't agree with Greenburg that browsing on a TV is a bad thing. It's a good thing IF you were allowed relatively easy connectivity of a remote keyboard/mouse.
One big limiter for the 360 for internet browsing is the MS policy of not allowing a standard USB KB/M to be attached. So a browser would cause all sorts of dilemma's for the 360, at present.