I'm going to say this: I love driving in Boston.
At off peak hours (10PM to 6AM), it's like an F1 level video game if you drive a little faster than you ought to. Going Eastbound on I-90 after the Allston gantry into the Pru tunnel? The financial district on a weekend? The Bowker Overpass dip and rise set entering Storrow Drive EB, followed by The Chicane starting at the Hatch Shell weaving to Leverett Circle? The 2000 feet approaching the Zakim SB on 93? All approaches to downtown from the south are GTA worthy views. If all they did was mock up the city from Google Earth and procedurally or algorithmically remove the cars, I'd dutifully drop my $40 on the DLC.
At all other times, you are going slow enough to actually look at how much great stuff is going on, and what an awesome town this is.