I don't know what somebody on the street would consider a 'perfect consumer', but an economist would use that term to describe someone who made strictly rational (i.e. objectively good) purchasing decisions. Maybe I've been drinking too much kool-aid from the econofountain, but what on Earth is depressing about that?
Perhaps look at this to temper the econofountain -
http://www.forbes.com/sites/peterubel/2014/12/15/is-homo-eco...
Take 2 bundles of products - A & B. They both cost the same, but bundle A would bring you 2x as much joy/utility/whatever-you-want-to-call-it than bundle B. To choose bundle B would be "less good" for you than choosing bundle A: that's what irrationality is...by definition. Choosing A is the "most good" option: that's what rationality is. Someone who chooses A over B 100% of the time is a "perfect consumer".
Substituting a term of art for a common usage is a bug, not a feature.