to think something is questionable or improper; to have reservations about something. Often used as a polite or indirect criticism.
彼のやり方は（ちょっと）どうかと思う。
I have reservations about his way of doing things.
面接にその服で行くのはどうかと思うよ。
I don't think it's appropriate to go to an interview wearing that outfit.
正直、あの発言はちょっとどうかと思います。
To be honest, I think that comment was a bit questionable.