Unoriginallity and lack of self critisicm, usually the first is a sympton of the later.
Wanna know what i'm talking about? go to you tube, see how much crap is uploaded, how many times can you find someone who uploaded the same music as the 10 guys before him, only this time the user-made lyrics comes swirling in on the screen instead of fading in.
The same thing goes here, on this site "i know this is the 1o'th zombie apoc thread this week, but it has a twist! you're wearing a hat this time */tardface"
In some cases, originality isn't required for something to be usefull, in a thread liek this for instance, you're gonna see shitloads of replies that are more or less the same, but it makes sense, cause asking an open question like that, seeing that lots and lots of people have the same oppinion makes sense, by that you'll understand that "hey this is not just one grumpy dude who got teh wrong leg out of bed, who's tired about hearing how the cake isn't real, it's a shitload of people, maybe it really is a worn out meme"
If you upload stuff on an art forum for instance, sure you may very well have uploaded a pic or video remsmbling the same thing 10 peopel did before you and better to booth, but since you're uploading it for the sake of recieving criticism, it makes sense to do so.
If you upload a video on youtube for teh sake of criticism, it's okay, apart from the fact that you severely overestiamte the cahnces of getting anything usefull out of the youtube comments section, if you do it and goes "look what i made, it's so awesome!" and uploaded teh same pile of shit tons of peopel have done before you, you just fail.
But far too often, you see people uploading some truly uninterresting crap with no entertainment value or any otehr redeeming factors with comments like "i just saw this (link to identical video) so i thought i'd have a go on making the same thing" gratz, you just marked yourself as an unoriginal attention-whore with no sense of self criticicm, bet you parents are proud, but then again it's prolly their over-use of back-padding and lack of constructive criticicm taht made you this way in the first place...
This is also true for memes, some are funny, for a period of time, some are never funny at all, yet both get spammed to everyone is sick of them and then some, think about the cake, now you know what i'm saying.
Some are better suited for living on, cause they're made in a way so that the people can keep making new original versions of them, think about demotivators, ofc lack of self critisicm ensures that 90% of them are shit or worse, but new good ones keep showing up.
If people but a little mroe effort and thought into what they spewed up on the interwebz, maybe you'd have to dih through much less crap in order to get to the good stuff you came for.
better end this here, rage-off.