actually the system didn’t rate the thread. Rather a post and poster. But here it seems far tamer.I don't see the upside in rating up/down. Maybe offer the thread creator the option to label an answer to their question with *Resolved/Answered*
All in all, I guess it's not a big deal. I can't see me sorting a thread by a rating, as most threads the answer evolves over time and posts. Reading posts in order seems really important.