I've worked with a startup in the medical device space. Well funded. They were indistinguishable from most other startups, except in one detail: they did everything right. They made some extremely high tech stuff, very lightweight, and technology wise they were closer to watchmakers than to software and hardware people. I loved working with them and helped them to improve their yield (their QA was so strict that of their initial couple of runs more than 2/3rds of the devices got binned for the smallest infractions).

I suspect you may have just been unlucky with where you ended up. I'm getting closer to retirement myself but I no longer have to work for 'the man' so in that sense I got really lucky. But I really sympathize with how you feel. So, count the days, and look forward to something nicer. Best!