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They aren't all that bad considering you have 60K miles on them. I have seen much worse in other cars. As others have said, it is time to change them anyway. Personally, I would change them and check them again in 15K miles.

This could be caused by cheap gas. Could also be caused by lots of short drives.

My #3 cylinder plug has come loose several times. I started torquing it about 0.5 lbft tighter and I haven't had a problem yet. I have no idea why it is just the #3 cylinder. Spark plugs that are loose won't transfer heat properly and can overheat. Loose spark plugs can also cause the stumbling you were feeling. Be sure to torque them properly and maybe check them again in 10K miles.
 
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