Question marks do not belong at the end of statements. I can live with it if there's an implied question and you'd naturally do the voice inflection, like "I assume you're coming tonight?" - even though that's technically wrong. But it's totally inexcusable to throw a question mark into a statement just because it's somewhere near a question.
- "Any feedback would be appreciated?"
- "I can't figure out how to do this?"
- "Seems like this should work?"