No problems with the major components other than brakes, which has been well documented. BTW, CR recently tested Toyota hybrids vs. their non-hybrid counterparts, and low rolling resistance tires standard on the hybrids resulted in an average of 8ft longer braking distance from 60mph. The dinged categories:
Body Integrity: Squeaks, rattles, wind noises, loose or cracked seals and/or weather-stripping, air and water leaks.
Power Equipment: Cruise control, clock, warning lights, body control module, keyless entry, wiper motor or washer, tire pressure monitor, interior or exterior lights, horn, gauges, 12V power plug, remote engine start, alarm or security system.
In-car electronics: CD or DVD players, radio, speakers, GPS, communication system (e.g., OnStar), display screen freezes or goes blank, phone pairing (e.g. Bluetooth), voice control commands, steering wheel controls, portable music device interface (e.g., iPod/MP3 player), backup or other camera/sensors.
The Carnival didn't have reliability data posted, likely due to insufficient data from a mid-year launch. Odyssey reliability went up as of recent, the opposite with the Pacifica.