This is the 3 year reliability study for 2011 model vehicles.
Notice Jaguar has surged and is in a virtual tie with Mazda, BMW, Subaru and Chevy. Infiniti is a notch above those guys. Lexus is in some orgasmic cloud of reliability where in 3 years of ownership they will exhibit 0.6 problems. Crazy. BMW also had a jump since 2011 was the introduction of the N55 motor for all cars with the 3.0 turbo, which also include all new fuel pump assemblies, and all new injectors. The N54 was also refined and kept for the Z4 and 335is, though.
Nissan has plummeted primarily because of the steering column lock failure issues that plague every single Nissan from 2009-2012. The culprit is a faulty motor that would not unlock the steering column when the car is turned on and will also not actually allow the car to start. Fortunately, I never experienced this in my Z, because I pulled the fuse that controlled that awful little demon motor (with no ill effect), but it was a very widespread issue that left even GTRs stranded. I think Nissan actually issued a recall for it last year.
JD Power stated there was an alarming amount of 4-cylinder motors that were highly problematic. You can blame Volkswagen and Audi's entire lineup for that. Those motors are riddled with camshaft issues, oil burning, thermostat lock/no coolant flow/overheating, and a deluge of other embarrassing issues that you'd think we left behind in the 80s and 90s.