1) I don't think we even played 3-5-2 in the game against Sunderland. If we did who are the three centre backs in this team?:-
Sheff Utd: Tracey, Borbokis, Quinn, Bruce, Derry, Hamilton, Ford (Marcelo, 23 ) , Marker (Nilsen, 45 ) , Kachouro (Henry, 45 ) , Woodhouse, Stuart
I suspect the real problem that day was the presence of Bruce himself and Nicky Marker at Centre back rather than the system.
2) Spackman did play 3-5-2 and I don't remember us getting too many "ass rapings". Our record under Spackman was P43 W20 D17 L6 PTS 77 AVG 1.79 Win% 47%
3) I think it's our best formation with the current squad because we don't have the personnel to play 4-3-3 (No good attacking midfielder if Britten plays deep) or 4-4-2 (No pace up front and the wingers get tied down by defensive duties). 3-5-2 gives us a solid base and allows Ward and Yeates more license to attack and create.