@Psychedelic Casual gets it right about atmosphere: I think it's been better this year but it could be even better for some games. The problem is the location of the two singing ends and their inability to sing together when the away fans are loud. I know people go on about allocating the north stand as a singing area but that's not going to happen because it's a major upheaval.
A good atmosphere is when songs spread around the ground. Crowd psychology means that people around the stadium only join in if a song is loud enough and they don't feel stupid. I tell you now, from the top tier of the Colin Bell, when the SS level 3 sing a song it is loud as fuck and bounces round the stadium because it both bounces of the roof and spreads both ways fast.
A cheap, simple and almost fussless quick fix would be for the 1984 group to relocate up there. A couple of hundred of them would be enough to get songs going up there and the rest of the ground would follow suit. I know I've said this before and been told they want to do those "display" things but they aren't atmosphere and don't really matter.