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GoPro is in serious financial trouble. Action camera giant is at risk for potential bankruptcy
(www.digitalcameraworld.com)
This is a most excellent place for technology news and articles.
They've always been kinda crappy. I don't think that changed so much as competition got better. And then as competition got better, they started doing things like stupidly priced dongles for external audio input. This has been a slow burn in the works for a long time.
At the beginning they weren't "kinda crappy" because there really wasn't anything else you could compare them to. Nobody else made a camera that you could strap to your chest, or your helmet, or your motorcycle while you did something action-ey. They had fully waterproof cases too, so you could take them underwater.
As a camera, they weren't amazing. But, people weren't using them to take wedding pictures. They were using them in situations where a normal camera would be too heavy, or wouldn't stay attached, or wouldn't survive.
There's a reason they became a household name. They enabled people to do things that had never been done before, and they changed the way a lot of sports are shot.