Do you have tried other ?
I thought it'd be pretty obvious by looking at the roles, rather than just the formation, that this wouldn't be a defensively solid tactic (at least when you aren't a very, very top team)? Two very attacking full backs, two midfielders who are going to press high up the pitch (so no help for the two CBs), and then the rest of the midfield on attack.
Have you got any screenshots of your successthis is the best fm 14 tactic