On Loglines: There are certain answers to logline problems that many of us seem to repeat as we give advice.
Agreed with all the above.
Little addition I think worth mentioning is diagnostic practices.
If someone posts the same concept many times and each logline iteration, however great or small, receives similar comments there is a problem with the story. It likely comes down to one of two main problems:
1) Fundamental issues in the concept.
2) The poster is ignoring the comments given by the members.
Either way the poster is not abel or willing to understand how to improve the logline or concept.