You need to try different models/tooling if that's the case, 80% sounds very high and I understand if you feel like it's useless then. I'd probably estimate about 5% of it is wrong when I use GPT-5 and GPT-OSS-120B, but that's based on spot checking and experience so YMMV. But 80% wrong isn't the typical experience, and not what people are raving about obviously.
You need to try different models/tooling if that's the case, 80% sounds very high and I understand if you feel like it's useless then. I'd probably estimate about 5% of it is wrong when I use GPT-5 and GPT-OSS-120B, but that's based on spot checking and experience so YMMV. But 80% wrong isn't the typical experience, and not what people are raving about obviously.