People still make threads about and post images/gifs/webms from all four of those anime on /a/ pretty regularly, so yes, they were memorable. Mondaiji-tachi, I admit, I hesitated to include at first. It just happens to have been overshadowed by NGNL, which did the same kind of story but better, but people still talk about the lewd bunny, and it was a seasonal highlight at the time it aired. Aiura is at the top of its subgenre of JK leg anime, Love Lab is in many people's top three comedy/gag anime, and Ro-Kyu-Bu, along with its sequel, is many people's #1 of all time loli anime.
"Overrated" is hipster jargon for "it was good, but I'm too cool to admit that I liked it alongside other people who liked it at the time."
You can nitpick from any argument, but you're not refuting the central point that 2013 was a great year for anime.