People are always touting the "reliability" of electric cars, but that argument mostly falls flat if you're comparing it to any car built in the last 20 years. Internal combustion engines are incredibly reliable. They require basically no maintenance other than oil changes every 5K to 7K miles, and they'll run for 500K miles with no problems.
If you're having any sort of engine failure in an internal combustion car built this century, someone is being malicious and trying to break your car.
Tesla, on the other hand, has had to recall a percentage of their electric motors because they were ripping themselves apart after 10K miles.
All the other parts of the car - the parts that actually still fail on modern vehicles - suspension, electronics, climate control, brakes, drive train, etc. are more complicated in a Tesla than in a regular car. The tesla has an electronically adjustable suspension, remotely upgradable electronics, climate control that doesn't get to run off of excess engine heat and belt driven compressors, two drivetrains (two transmissions and differentials), and regenerative braking. These systems are more complex than normal and only time will tell if they're more reliable than their legacy auto industry equivalents, but my feeling is they won't be.