In Italian, if I say Indossano certe scarpe. (which Google Translate translates as "They wear certain shoes."), I would be expressing a negative opinion about the shoes, for example that the shoes are inappropriate for the place, or they make appear ridiculous who is wearing them. That doesn't happen with Certe volte sono triste. ("I sometimes am sad."), though.
Can "certain" imply a negative opinion about something/somebody?