You hear this a lot in The Apprentice. People shouting over each other to announce that “I have a good idea”.
No. They have an idea. Whether it is a good idea or not is to be determined.
No-one ever shouts out “Wait! Wait! I have a terrible idea!”. Everyeone thinks their idea is a good one. If they thought it was a bad idea, they would stop thinking it. Smother it at birth.
An idea in itself has no merit whatsoever, but it has potential. When that potential is realised, then you know if you’ve had a good idea or not.