I don't use Quarantine OR use the Recycle Bin as 'temporary storage'. Once a file goes into either. I delete it or erase it. If you have a current, correctly configured anti-virus program, updating right before the scan, then it should be quarantine> delete.
Some spyware/adware 'finds', on the other hand must be 'proven' first. Most of us have probably had a false reading in a spyware program, something in the system that has been read heuristically and may resemble spyware, but, in fact, is not. Then I encourage the user to verify the process if there is any doubt as to it's classification.