Grand Theft Auto: San Andreas
Yes, this game is fun again. Despite having to swim for 20 minutes to build up my stats to take a story mission; despite another mission that had me driving all the way across the map - back to Los Santos - and fail when I drove too slowly (and then again when I drove too quickly); despite dying at the tail end of a mission when I exploded, inexplicably - apparently I didn't see someone throwing a grenade in my shoes.
The incredibly ambitious scope of San Andreas amplifies the engine's shortcomings and the still-maturing mission design staff's flaws. But there's still plenty of fun in here. I finally got out of San Fierro, and I just did a mission where I drove a monster truck around the desert. This beast is probably the pinnacle of the GTA3 engine: an off-road vehicle that can actually be steered. I love this thing.
Progress: Trolling around the desert