I heard it used in every single situation possible at a LAN part last weekend. Blegh.
It won't be long before everyone is sick of it (a week), and then it will die like all recently created memes.
The lifespan of a meme has dropped considerably since their conception; look at 'over 9000' compared to 'errmahgerd'.
Anyway, in regards to Marth/ICs.
This is how the MU happens at top level - how is that Marth's favour, at all? See how Mike had to space every single thing perfectly or he died, while 9B just had to walk forward and shield to apply pressure?
I bet that Marth > ICs only started as a thing because
"derp Marth beats ICs in Melee" (he doesn't really, but that was popular opinion for ages)
"derp Marth can up-b if they **** up the CG" (lol, that ain't DDD)
"derp Marth can out-range them" (Yeaaahhh, Marth's effective range is meh due to his speed and limited options)
NOTE: I do realize that vid is more of an argument for even, I'm just trying to stress that ICs don't lose