Side note, but, um... it's generally not a good idea to leave grammatical reviews if you make a lot of grammatical mistakes yourself. Not to be mean or anything. It's just a little bit of concrit. Always proofread your stuff before submitting.
For example...
you misspell "apostrophe" several times, use an archaic form of the word "spelled," misspell "separate," suggest incorrect capitalization (you never capitalize the first word of a dialogue tag if it follows the quote it's tied with unless the first word is a name), neglect to punctuate two sentences (the ones where you use smilies at the end), fail to put a comma in the compound sentence where you're commenting on a lack of commas, misuse a semicolon (putting one -- the only one in your post -- where you should use a colon because what follows it isn't an independent clause), and, at one point, didn't capitalize the pronoun I. I know. It sounds like a lot, but I was hoping that pointing out all of those errors can give you a good visual aid for the point here. Namely, a cleaner grammatical review is a good way to show off the skills you're trying to promote when you go to comment on someone else's story. In other words, telling someone they don't have great grammar while letting yourself make a lot of errors in the process just doesn't set a good example.
It would also help if, when commenting on someone else's grammar, you explain
why it's better to proofread and whatnot. The reason why I say this is because the end of your review seems to say that spelling and grammar isn't that important. (You say it's
just spelling and grammatical errors that you're pointing out.) So, the writer doesn't walk away having learned much of anything at all. The same could be said if you
didn't say that part because the writer wouldn't know why the things you're pointing out are mistakes, which means they won't be able to avoid similar problems in the future.
So... yeah. Always try to proofread and explain things whenever you go over grammar and spelling. That way, your concrit will be a lot more valuable to the people you're reviewing.