SWG was fun while it lasted...at least for me. That was my first MMO, and I've yet see the same kinds of custimization, mainly housing, in other MMOs. I joined a little before Jump to Lightspeed came out, and I left a little after the Combat Revamp.
I didn't buy WoW, but I saw plenty of it. I played SWG, a little Lineage II, and Guild Wars.
Now I'm in Lord of the Rings Online, which is amazing. I'm a hobbit minstrel, playing music to slay my foes and heal my allies! I drink eat, drink, smoke, and talk about the three!
But still...personal homes like they had in SWG would be a godsend...the only problem I see is that it clutters environments and often makes things laggy. But it didn't seem like a huge issue in SWG....
Picking your own house design, or heck, flying in a space cruiser with 15 people inside, in a hot tub I put on the second level of the ship, watching in real-time out the huge windows as we passed Tatooine, with both TIE Fighter and X-Wing player escorts on my side. (I was part of a neutral guild, and we invited both Imperials and Rebels...they liked to escort my ship sometimes for protection, and just cause it's fun)
Man...Star Wars Galaxies could have gone somewhere...