It depends on who you get in FA, and if your getting the right positions that the team needs.
If a team is a bad team signing a few FA isnt going to make them a winner, but if a team is already fairly good,
Then signing the right position FA's can put that team in a position to go all the way.
Both Denver and NE won SB's after signing the right defensive players they needed.
So it does work if done properly and smartly.
A team has to properly identify the positions at which they need a good player first, then get one in FA.
If you dont identify the right positions it wont help enough to make a difference.
It also helps to sign players who are really still good, and that you know how your going to use them, and
they fit what schemes your going to use.
Even then game planning and play calling have a further effect on whether this all works good or not.
Dallas does not place a lot of value on many positions, DT, RB, Safetys, and they think we are good in the other positions,
like CB and LB .
It doesnt look like they will make any big FA moves, and will try to get what they want in the draft.
They did make a weak attempt to get murray back , but failed at that.