I feel like it can also mean that it's hard to give a definitive good/bad opinion about a thing that you haven't had a chance to evaluate properly

Like there's both good and bad aspects so you're unsure which way to feel.
フォロー

@moth_ball for English speaker yes it can be good or bad, but in Japanese it definitely criticize bad for people , and why I hate this phrase is that it doesn't tell people what was so bad just saying nothing but "questionable"

Yeah, I see that type of usage in English and Finnish as well and I suppose it's a way of not trying to start an argument. It's just very passive aggressive and I dislike it too.

If it's about general behaviour and not something that's a matter of taste, people should at least elaborate why they feel that way.

for english, say "i don't know..." in doubting tone always means like that "i think you're wrong...
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Fedibird

様々な目的に使える、日本の汎用マストドンサーバーです。安定した利用環境と、多数の独自機能を提供しています。