I'll go first

Counting on Scott Rolen to be a solid defender/ clubhouse leader/ not a hole in the lineup for 100-120 games at 3B? Good idea.

Counting on Rolen to be your cleanup hitter for 140 games? Bad idea.

Bringing back guys like Gomes, Hernandez, or Cabrera to be paid like and treated as bench players a la Edmonds and Cairo? Good idea.

Bringing them back on a team with a manager who will treat them as everyday players in their prime until you pry the lineup card from his cold dead fingers? Bad idea.