If I remember correctly we rarely used 4-3-3 in the big games last year.
Vs Chelsea at home we played a 4-4-2 with Rooney and Tevez. Giggs played slightly tucked it, but still on either wing.
Vs Arsenal at the emirates we played a 4-4-2 with Hargreaves and Anderson in the middle.
Vs Liverpool at Anfield we played a 4-4-2 with Hargeaves and Anderson in the middle
Vs Liverpool at home we started with a 4-3-3 with Anderson, Carrick and Scholes in midfield. But, we were winning 1-0 and Liverpool were starting to get a grip on the game andbegan dominating possession (despite being down to 10) so we brought on Tevez and Nani, went to a 4-4-2 and scored 2 more goals.
Vs Arsenal at home we played a 4-3-3 with Hargreaves, Scholes and Carrick and Arsenal had the beating of us. We got an underserved equaliser and straight away we brought on Tevez and Anderson, went to a 4-4-2 and ended up winning.
Vs Barcelona away we played a 4-3-3 with Ronaldo up front and Rooney on the left. This was arguably our worst performance of the season.
Vs Chelsea away we played a 4-3-3 and were very poor and Chelsea took a deserved lead. Then we went 4-4-2 and for 10 minutes we were excellent and Rooney equalised. We then went back to a 4-3-3 and Chelsea scored a deserved winner.
Vs Barcelona at home we played a 4-2-3-1 formation with Carrick + Scholes in midfield, Ronaldo, Park and Nani as the '3' and Tevez up top. We played quite well.
In the CL final we started with a 4-4-2 and hammered them and should have taken a 4-0 lead at half time. Later when we became tired we went to a 4-3-3 and Chelsea were the dominating team.
We are no where near our best when we play a 4-3-3 IMO. Depending on our personel a 4-2-3-1 can and does suit us however.
In the majority of big games we have faired better when playing a 4-4-2 than any other formation. It suits our style much better.
Think back to the days where we would struggle away from home even against the worst of European teams. Why? Because we were too catious and played a 4-3-3.
It just doesn't suit us. We have to play to our strengths - which is attacking and playing attractive football.