It's an art form, like all others (dance, painting, singing, tattoo, theatre etc. whatever takes your fancy) it can be a way for you to express yourrself, a way to escape or a way for the writer to send his/her message to other people.
As for what makes a qulity peice of poetry, it varies for all people, but the most powerful are the ones which can envoke an emotion, make you see things in a different way for bring any scene to life, one of my favourite peices is about a woman in an apothecary saying how she likes to watch the coloured vials of poisen glisten, I love it because it's such amazing imagrey.
A quote from Oscar Wilde says that 'All art is worthless", I think he is right- all art is worthless, but all the best things in life are. Love is useless but what he is trying to say that all the useless things in life be it art or love are all the things that make life worth living, they're the extras that make life worth living.
Anyway, I'm going to start rambling on now and getting philisophical so I'll leave it a that. Hope my opinion helps.
