Would be curious to hear your take on how the 3-5-2 usually gets broken down given your experience watching Italian football, NickA. It's been a long time since I saw a lot of this formation.
I continually watch teams try to combat the 3-5-2 with Juventus. Some succeed, most don't. They have been adapting lately, going into a 4-4-2 when necessary. They mainly switch when they get bogged down when a team uses a single striker system...like a 4-5-1 or 4-1-4-1. They'll push a CB out wide and push Alves, Sandro or Cuadrado up to the outside mid. If an opponent stacks the midfield, the 3-5-2 can't breathe and you start to see too many sideways and cross-field passing. That's when you know you are locked into them. Obviously Juventus has the personnel to adapt...but that is how they lose...they can't get out of their own way and the offense becomes stagnant.
The beauty of a 3-5-2 is that it can be extremely hard to breakdown. On a narrow field with 3 midfielders, you can count on a double, sometimes triple team every time you have the ball in midfield. They didn't even need to try hard to press us, it was automatic. It leads to turnovers and if you have a solid striker trio (which they do) the counters are dangerous.
If Viera's plan was to hope Harrison and T-Mac could track back and be an outlet for the midfield, he was completely mistaken. I think Shelton and Mendoza would've been better options. In an aggregate scenario where TFC was in the drivers seat and knew that we had to play attacking football, we served it on a platter for them. There is no way that we have the personnel to go 3 v 5 in the midfield.