I agree.
The atmosphere has gone flat, especially this campaign. Its almost as if you're frowned upon for singing and looked at with a disapproving look. This might be because we've been moved around the campaign and the games at home haven't (No offence to the teams) been challenging opponents.
The away games always produced the most vocal performances, its the fans there that really want to see the team and encourage them on. The home games are surrounded by families and who just go for a day out (no problem with that) but it doesn't bring the atmosphere that used to be around.