Some poetry is just what you say, it has guidelines but no fast hard rules. Other forms do have fast hard rules, such as rhyme scheme, meter, number of lines, number of syllables in each line. There are so many different forms that even those with no rules or guidelines generally follow a pattern of some sort. As for spelling, first a lot of mispelled words show that the writer doesn't care enough for his/her own work to spell properly, if it is full of spelling errors, it is difficult to read, as the mind will slow down and respell the words and the flow, if any, goes away. The same with punctuation. No punctuation in a poem makes it a long run-on sentence regardless of line breaks. Just as it is your right to call anything you want poetry, it is someone else's right to call it non-poetry. If it flows, and reads well and has some type poetic quality to it, I will not argue if it is or isn't poetry, but if you write an English sonnet with 7 lines that don't rhyme and are not iambic pentameter, then we will disagree, for that form has rules. The same with a Dondicrostic Quint. That is a quintuple acrostic with the first letter of each word forming another word reading down line by line, except for the end words, and the use the last letter of the word. It doesn't have to rhyme, each line contains 5 words, there can be any number of lines, but the words formed must be some type of phrase that when read, make a statement. Those are the rules for that one, because I created it. cya later.