I don't get most modern computer games. I don't understand the appeal of RTSes, nor FPSes (though I did like Doom), nor any MMORPG. I miss the days of turn based strategy games - I don't know what I'd do without consoles to get my fix for tactical combat games.
I actually like the Sims a lot - I think it's like roleplaying. You basically create a whole bunch of characters and give them personalities and backgrounds, and make them act them out. Granted, you have to pretend a bit, but like I said, it's kinda like roleplaying. Okay, it's more like role-playing soap operas, but still, I like trying to come up with different characters.
I really didn't get GTA3. I really liked Vice City, because a) it's just like being in Florida, where I used to live, and miss b) it's like being in the 80s, which I also used to live in, and miss somewhat c) it's like being in an episode of Miami Vice - Tubbs is even in it. Also, the characters are pretty good, in terms of depth and characterization, including the guy you play.
GTA3, OTOH, just didn't do anything for me. Your character never says anything, and is basically a nameless, generic thug. No personality at all. Some of the other characters have some personality, but very little. The city is very bland looking, doesn't remind me of anywhere I've been. No atmosphere. And the gameplay seems so much more limited, in terms of the variety of missions, and the linearity. All you do is work for crime bosses. in Vice City, you become a crime boss early on, and work for yourself.