I dislike it because I don't like the sound - at all.
I've heard quite a lot of Nicola Mazzanti before... I appreciate that the guy is an awesome piccolist... I had a listen to most of the soundfiles on his site in an effort to change my own mind some time ago... and I still hate the sound of the picc. If HE can't convert me..............
The only time I find it bearable is in its lowest reaches... where one may as well play the flute!

I'd rather hear a flute in its second register than a picc in its low register.
Alto and bass flutes... them I can see the point of

(No offense intended to any piccolists: I know many people like the
nasty little thing instrument... I don't, but my posts about it are usually somewhat tongue in cheek

!)