I love this tactic.
I'm using it with Juventus and just destroying the league. It's especially great for top teams because it can cut apart that %$@#&ing ultra-defensive flat 4-5-1 the AI tends to use when it's a heavy underdog. The AI thinks there are 5 of your guys attacking: the wingbacks, the two forwards and the attacking CM. So it doubles up defenders on the two wingbacks, double marks your primary forward, sends a guy chasing your False Nine around, and sticks another guy in the CAM's face. Now the AI thinks he's safe with his extra midfielder free to respond to problems and his forward hanging outside the box waiting to counter...
BUT!
You've actually got seven attackers, as the two B2Bs (if they're quality) will surge into the box late and catch through balls from the CAM or the F9. This leaves a lot of open net for Vidal or Marchisio (they've combined for 16 goals through 20 games for me), and even if the keeper blocks the shot you've got 5 guys in the box ready to pounce on the rebound.
Now for the caveats: if you are not playing with a high-quality team, this tactic will probably not work for you. This is a gambler's tactic. It's high risk/high reward. As I said, when you have possession deep in the enemy's half, you basically have seven players looking to attack. If your HB and CDs are not super high quality, you WILL get countered to death.
And that's fine! It's not meant as a criticism. There are already a thousand tiki-taka tactics out there that **** and dunk around midfield. This tactic goes for the throat. So be aware of what you need:
- every single one of your players needs to be in the right place at the right time, so anticipation, decisions and acceleration are critical across the board
- the HB is your only defense against counters. He needs to be very smart (high decisions and especially high anticipation and positioning) but it also helps to have low aggression so he doesn't chase himself out of position. He doesn't need to be strong or a good tackler, he just needs to be smart. In my game, Pirlo is playing this role perfectly...but obviously, players of Pirlo's quality aren't very common.
-with a HB and two CWBs, your central defenders will tend to drift wide to cover more of the field. This means they are covering a lot of territory, which means they need to be pretty quick. In my game Chiellini and Bonucci are doing fairly good, but Barzagli is barely adequate, and that's only because of his super high positioning and anticipation...his low acceleration and work rate combined with his low stamina means he often doesn't get back into the play when the AI tries to split the defense through the middle. So, you will need quick, hard-working defenders with good acceleration, work rate and anticipation. Players like David Luiz and Koscielny will work great. Big slow guys like like Hummels and Mertesacker will not work at all.
- Don't expect much from your Complete Forward, he's going to have at least one guy hanging on to his jersey at all times. In my game, Llorente is getting the occasional goal only because of his extreme aerial ability. For the most part, he's just an expensive (but very effective) decoy.
Again, I'm playing with Juventus, a top quality team with ace players in every position, so take that for what it's worth. And this tactic hasn't performed well against high speed counter-attacking teams...Benfica and their super fast wingers tore me apart in the Champions League, with Salvio, Gaitan and Rodrigo combining for four goals. But other than that, it's been fabulous so far. Thanks for an awesome tactic!