I had a miserable time with the Broadcom drivers as well-- I actually abandoned them completely to instead use an adapter with Ralink driver. No hiccups, let alone crashes, since.
No. It's better than no driver. (I'll assume it works at all in some capacity.)
While there are some companies that make wifi cards you can't use easily, that's just one thing you check before buying, just as e.g. general reliability/performance.
That's way worse than no driver. By 'crash', I mean the whole kernel crashes. And, by the way, it does advertise linux support (for linux 4.10, but that's in the fine print).
