I agree with you that labels are silly. But I don't think there is anything particuarily "ironic" about a gamer wanting fantastic graphics or more reasons to replay a game. Some people like story, some controls, some a new experience, some just another FPS, and some unique or cutting edge graphics. For example, racing games are my favorite genre. There's nothing like flying through the tracks of Burnout and Pacific Rift. In order for a visceral experience, only the latest and greatest graphics will do. Going back to most GCN/PS2 racers now is a yawn fest (save Mario Kart and Twisted Metal) Therefore, top notch hd graphics increase the gaming out of body experience for many people and become a legitimate request.
Back to your first statement though. If the vast majority of "hardcore gamers" praising hd graphics, actually played their respective 360/PS3 on a 15 year old CRT, well, that would be ironic. Almost as ironic as gamers who whine about gamerscore and long for the days of old. Days where the score chase was alive and well in arcades across the world. Donkey Kong anyone?
First of all, what is this tangent on visuals? 1080p is a resolution, not a whole new graphical coat of paint. A game with fantastic art design will always look fantastic, no matter what resolution it is represented in, and games that look like crap will not magically look great when that resolution is increased. And it is for that reason I find this exaggerated enthusiasm for 1080p completely unnecessary. And if you cannot go back to a game because it lacks the highest resolution or visual fidelity possible, then well, I feel bad for you.
And surely you jest about the arcade comparison to achievements. A game in the arcade with a scoreboard is a single game in which players compete for the highest score. The point system that achievements and trophies entail involve every single game and a TOTAL score. No longer is there a competition for a single score of theoretically-infinite outcomes, but who has the most spare time to perform ridiculous tasks and rent awful games for a set number of achievements. This is what I have been attacking, not the inclusion of achievements themselves, yet you keep skewing it in illogical ways.