no. i think most fans will prefer trophy rather then entertaiment football. Just like liverpool in 2005, people will remember they win the UCL, but wont give a damn they play boring or defensive football as trophy still matter the most. In fact most managers will do this ... same to those minor teams in epl when travel to the big 4. defend deeply to at least get a point.

if Man U play attacking football during the 1st leg i think Barca already booted them out with 2 to 3 goals ...