It may not be great, but it works in a pinch. Like, say, when you are thousands of feet above the earth. Can't hardwire that.
That would be awesome 
Internet access on a plane is awesome though 
Oh and wireless signal is pretty much the same up to 15 feet. I'm like 200 feet away from my router and there are tons of obstructions in the way, and I still get 40% signal strength. (This is 4/5 bars in Vista, but it's really only 40% of the strength of a hardwired connections)
Satellite internet is basically just a big, high powered router with a really well made reflector. If they could build cassegrain receivers into computers we would all have great internet via satellite everywhere on Earth. I predict that 20 years from now, most users will use satellite internet at twice the speed we have now on wired connections.