Considering the downloadable content comes promptly every week, Rock Band songs will eat a normal Xbox 360 hard drive within a matter of weeks. With Nintendo's stubborn refusal to add ANY hard drive for the Wii, it's unrealistic to expect the same level of downloadable content.
We can go on about Wii owners getting the shaft. As far as Guitar Hero 3 goes, no downloadable content was the least of their problems. It wasn't even in STEREO! I think Wii owners will just be happy to get anything at this point.
Are you trying to marry someone? Because you can only marry the people on Sim Lane. I have the PS2 version, and on that one, there's one house open where you can make your own Sims (in Free mode, I think)