I'm a season ticket holder, and you can hear singing from all parts of the stadium, we are the opposite side from the TRA who sit above the tunnel and we can hear them loud and clear. I also agree that the issues with Old Trafford are exaggerated. And there are many reasons for this. One being that all of the media, journalists, commentators and pundits are housed in the oldest and crappiest part of the stadium. That Bobby Charlton stand has sections that date back to 1910 and the main bulk of it was built in the 1960's. So if you're covering a game one week at Spurs, or Arsenal, then come to Old Trafford, you would notice a significant drop in the facilities.
That said, the part of the stadium that I sit in, was built in 1997, and to my left, the quadrants were built in 2006 and the extensions to both ends were completed in 2000, so by no means is it "falling down"
3 sides of the ground are perfectly fine, the Bobby Charlton stand needs to be addressed and we no longer need the sloping roofs to let sunlight onto the pitch, as everyone uses UV lights on wheels now. Look at what architects did with the Bernabeu and take that sort of idea and see what can be done with what we have. Which is a fantastic stadium built for football. Not for athletics or concerts. No running tracks or removable pitches, just a great football stadium for us.