Some companies succeed in spite of their engineering teams, and some companies succeed because of their engineering teams. What exactly is a good company? Is a great engineering team backed by incompetent management a good company? Or what about a company that has the full package but is unable to mail out paychecks on time and has a HR department that runs off anybody who exhibits an iota of independent thinking. It's really hard to say until you really meet with the company and spend some time there... and even then it's imperfect.
That's why I said "innovative, ships products, ahead of their competition, AND people like to work there". You can't get all of that without a quality, cohesive team covering many disciplines. And a bad hire into such a company increases the danger of derailing things. Thus, it's in any good company's best interests to carefully iterate and improve on their hiring practices, and any company that survives a long time with all of that intact is probably doing a lot of things right, including hiring.
