I personally don't like the new Genesis front end. It doesn't look as good as the models they have now. The Genesis has perks though, their interior is much better than the WRX's and the sound system blows the WRX's out of the water. The rattle issue doesn't seem to be a problem for the Genesis either but I'm sure after the normal wear on the car you'll start noticing it.
You can't match the AWD the WRX has though. My good friend has a 2011 Genesis and I know he had a tough time with the snow and ice this winter. I didn't get snow tires this season but I still managed to do well. I imagine when I get them put on next season it'll be 100x better than how its been. Best way to determine what you want to go for - test drives. Go drive around some 2011 Genesis's and some 2008+ WRX's.