BMW is known for high quality, but its interiors can be dark and cramped. All are true to some degree in the 2010 M3. The wonderfully snug front sport seats have plenty of room side to side, but a little more space in the footwells and a little more tilt to the bottom cushion would make for ideal accommodations. However, the design of the front seats is "aggressive," contends Edmunds, noting that they are "multi-adjustable (under thigh, side wings)" and feel "custom-made to your body once you've dialed in your adjustments." The adjustable backrests keep you situated in the M3 BMW "when slicing through narrow canyons," claims MyRide, and even though the cockpit is "snug," it's deemed "roomy enough" by Cars.com.
Not that you should worry so much about rear-seat passengers in something so singly focused, but the space back there isn't lavish, even in the four-door model. Motor Trend dubs the rear seat "useable (occasionally)," while Car and Driver is a little more generous, saying, "rear seat-space with two adults is tight but livable."
Trunk space is decent in roofed models, but the hardtop convertible swallows its own cargo volume when it stacks its top away. Car and Driver finds trunk space to be "more than adequate." According to Cars.com, trunk "access is a little narrow." However, you can use the "folding split rear seats" to add cargo length at the expense of rear-seat accommodations if you'd like, claims MyRide.
Quality is mostly good, with noise playing a role in opinions of the 2010 M3. Edmunds wrote that the build quality for the M3 was excellent, and Autoblog added that most of the controls were in well-placed positions. Edmunds complained that the interior was a little boring, and "subdued," but most have noted that the rest of the car is anything but. The big V-8 underhood makes great noises, according to Automobile, who added that it was the most ferocious V-8 they've heard aside from Ferrari. Edmunds only noted subtle tire noise from the big, optional 19-inch tires, and noted that the sticker compound tended to drone. Cars.com didn't take exception, only noting that the M3 had more noise when driving on "porous pavement."