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## Put it in a comment if it's just "It's fine, no problems here".

As with most answers that aren't substantial enough to warrant their own answer post, I'd say to just leave a comment. As you said, knowing that *n* people find it fine has value in itself, but probably not enough value to warrant *n* answers.

## Put it in an answer if you add further details

Conversely, if you add further details to your "it's fine", such as optimization suggestions or just plain analysis on what was done well, then you should make it into its own answer.

## Overall though, avoid just saying "It's fine"

"It's fine" is a very loose term. Even if the code runs perfectly fine, there are probably still some points of improvement that you can point out. Maybe there is a faster sorting algorithm that they should be using. Maybe their interface, while working fine at the moment, isn't easily extendable. There are loads of things to say beyond "It's fine", whether it be in the comments or in an answer.