In browser mining, good or bad? Why?

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Depends on how you deal it with your web visitors. They know ? They do not know ? Is it on terms of use ? is it clear about how % of cpu it will consume ? That will make difference.
Depending on which side of the mining you're on. First of all it's very inefficient and you need thousands of browsers in thousands of computers to work full time 24/7 to have any meaningful impact. If you're on the consumer side and you catch your browser mining whilst you're visit some website, the reputational damages of that service or website is irreversible. They're done from PR perspective.
Good for miners who mine from millions of users browsers like piratebay... but for individual mining it counts for nothing just a waste of time