One can not contemplate modern poetry without taking into account the change in medium. The ease with which anyone can "publish" poetry on the internet has definitely lowered the bar on what constitutes good poetry. While it is great that so many people are expressing an interest in poetry, I have also found that many people have taken the American Idol view towards any criticism to their writing. Regardless of what the judges say, they still think that their writing is great. I have been a member of various poetry sites where people are not looking to improve their craft, but only to get warm fuzzies from fellow site members. This has caused me no end of frustration as I am looking for a deeper analysis of my own writing, so I can improve and grow.
We are at a time when almost anything that a person writes can be called poetry, if the author so desires. Modern poetry can be abstract complete with underscores and other various symbols and capitalization in any haphazard fashion or it can go to the extreme right following a strict iambic pentameter. The doors have been opened so wide that any dilluted string of words can be called poetry.
Modern poetry is an amorphic thing and the true test happens in the future when our descendants look back and say, "This was the poetry of the 21st century." I only hope that we are not viewed as attention starved praise me hacks.