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. According to Edmunds, "Build quality and materials inside the M3 are excellent." The placement of controls is "ergonomic," says Autoblog, and the materials used in the BMW M3 are top-notch. Even so, Edmunds finds room for complaint when it comes to the interior, labeling it "monotonous" and "subdued." Automobile adores the sound of the M3's V-8: "Mash the loud pedal, and the quiet V-8 turns into a screaming demon," they rhapsodize. "It sounds angrier and more ferocious than any V-8 you've ever heard this side of Maranello." Edmunds reports that the M3's optional 19-inch tires are noisemakers: "these sticky tires are prone to generating noise ranging from a slight hum to a somewhat annoying drone." Noise is "unobjectionable" in the 2010 BMW M3, according to Cars.com, except when you're driving on "porous pavement," which really brings out the whine from the tires.