What makes a good poem?

What makes a good poem?
To be honest I can’t really tell.
One reader claims perfect genius
while another mimes awful smells.
Two different reactions
to the same collection of words,
perhaps the system of judgment
rings faulty and a little absurd.
A poem only just sits there,
organized marks on a page.
Consider this measure of goodness —
is it static or does it engage?
Do the words beg you to say them?
Gather sounds up in your mouth?
Find their natural cadence,
climb north then dip down south.
Others may have an answer
but I truly can’t say.
To me, a poem — to write one —
a simple, plain form of play.