Accuracy in general is not the most interesting for me, but AAAs are fun to go for sometimes. I think FFR is partly to blame for it (it's a grind-or-suck game), but also the sheer difficulty of going higher than AAA on charts is immense. Setting a speedy AA on a file is usually easier, and practically never requires grinding. Doesn't help that only true AAAs/quads give me any satisfaction if i first want a good score
That and song-bias. Non-poly accuracy charts tend to be quite dull to listen to
Edit: Had to think for a while, as i had an unformed thought that kept bugging me. I think part of the reason acc is a bit "meh" for me, is that a majority of accuracy scores i see are from very basic chordjack charts; metronome charts if you will. Forum threads such as this one was far more interesting and engaging to look at (i ended up playing almost all the charts there).