When searching for that particular phrase to describe Bloggs try :-

• His crew would follow him anywhere but only out of curiosity.
• This man is not so much of a has been, more of a definitely won’t be.
• When Bloggs opens his mouth it is only to change over to the other foot.
• He has flown the detail to his entire satisfaction.
• He would be out of his depth in a parking lot puddle.
• Technically sound, but socially impossible.
• This young lady has delusions of adequacy.
• In my last report I stated that Bloggs had reached rock bottom. Since then he has started digging.
• Bloggs reminds me very much of a gyroscope. Always spinning round at a frantic pace but never going anywhere.
• He sets low personal standards and consistently fails to achieve them.
• Bloggs has the wisdom of youth and the energy of old age.
• This man will go far. The sooner he starts the better.
• This man is depriving a village somewhere of its idiot.
• Bloggs used to be something of a granny. Since then he has aged considerably.
• Works well under constant supervision.