I'll go on record and declare Lucky Star as anything but mindless, completely incomparable to Code Geass or the like. The show is that of a strong opinion, one carried by an unflinching speech. The delivery of a multi-layered meaningful assertion is the ultimate objective, a carefully calculated achievement towards an "altered state of mind".
The narrative strips a media swallowed down by purposeless plot convulsion from unnecessary fluff and successfully intertwines in a concrete shape of unyielding palpability what is commonly recognized as separate: argument, theme and symbolism take a single. From the depths of nostalgia the forgotten but powerful voice of honest beliefs surfaces within a technique of representation built over naked, yet fundamental, ideas. In more than one way this essential notion behind the storytelling is deliberately old-fashioned yet actively forward-looking.
Stagnation, mindless progress and the very nature of human "evolution"; with a manifest yet subtle use of imagery such an abstraction becomes core for the script. They're amazingly broad, basically limitless, yet due to their handling tangible enough to be substantial. Textually knitted into the actual writing without even resorting to term dropping; eloquently described through a seamless combination of visuals, dialogs and raw feelings.