Actually Consumer Reports placed the Model S at the third-worst of 29 positions, so at the bottom 7%. "Tesla Slips" is actually a pretty mild headline, considering they slipped 6 spots and 8 was the technical maximum.
It was Tesla as a whole that placed 27th of 29 on that list of average lineup reliability (tied with Cadillac at 28th). Tesla tied with RAM for the lowest "most reliable" model ranking at 49 pts, while squeaking by RAM and Volvo for lowest reliability of a model.
The news media loves a hero and loves even more to tear the hero down. The former sells to fans, but the latter sells to everyone.
It would be bias if they were somehow going above and beyond, but look around. The most successful companies in the world receive immaculate coverage when they so much as blink too loudly.
Of course, 50% all automobile manufacturers are in the bottom half, and sure, it's not where you want to be. But none of the rest get special attention for being so.
Want proof? Do a search for the the following: CNBC consumer reports reliability rating.
What comes up? In order:
1. "Tesla Tanks": https://www.cnbc.com/2019/02/21/tesla-tanks-subaru-soars-in-...
2. "Tesla Slips": https://www.cnbc.com/2018/10/24/tesla-reliability-slips-to-t...
3. "Consumer reports yanks recommendation for Tesla": https://www.cnbc.com/2019/02/21/reuters-america-update-2-con...
4. "Tesla Falls": https://www.msn.com/en-us/money/companies/tesla-falls-after-...
..And so forth.
Note, however, that we didn't search for "Tesla". The spotlight given them is CNBC's bias. There's an entire automobile industry out there, and at any given time, half of it is in the lower half of reliability ratings. But only one is ever given headlines for it.
That's bias.