I'd say 95% of QBs need to be well surrounded to play well. The way the draft is set up and the price of QBs, most QBs get overdrafted by bad teams. Of course most of them bust...
First, I'll give my flawed definition of a bust using corporate America. No supervisor considers, correctly, an 'average' employee a 'bust.' They're not. But some fans have two categories - 'top 5' or 'bust.' Yes, fans expect a lot from a QB picked in the 1st 10, but even then, reality says most of them don't end up being top 5 - many don't end up being starters. Most are, well, average or worse. That's the nature of any decision based on human judgement.
With that long preface, I agree with you. QB is an important position. Teams will gamble on a QB before any other position. And, like any gamble, the odds aren't good. Add to that my contention at any one time 3-4 starting QBs aren't NFL quality QBs. It's easy to see where this is going. The result is teams will pay a LOT for an average QB and expect more than average. Teams will draft a 'hope' rather than play a low talent QB next year.
Final thought. Good teams don't overdraft, but they STILL draft poor QBs.