Joshua 22:30 It is good to check out a matter and not jump to conclusions.
Judges 1:10 Only one generation later and the Israelites forgot their Lord.
Judges 2:22 Nations were left as a test for the Israelites, a test they failed. We likewise are tested in our lives. How are we doing?
Judges 6:13 The people knew the stories of their history, coming out of Egypt, yet they neglected to obey God.
Gideon had to have much faith to take on the hordes of men with just 300. It is understandable that he needed the fleece tests to bolster his faith in the face of the physical odds of one Israelite for every 450 Midianites.
Judges 11 Jephthah’s rash vow to sacrifice someone when he returned in victory is another example of not being wise with one's words. He later regretted his vow but would not go back on his word because he said it to God. Reading the HCSB commentary gives some insight on why he may have made the vow. The gods of the people around them were influencing the Israelites behavior. Chemosh and Molech, the gods of the Moabites and Ammonites, required human burnt offerings as a sign of total dedication.
Samson is like a little kid with a powerful weapon. Even though Samson was not honorable, God still used him for His purposes. Just because someone may perform “signs and wonders” does not mean that they should be followed.