I reviewed Child of Light myself and while there were definitely some instances of the rhyming scheme stretching to stay consistent, I wasn't overly bothered by it (and that's coming from someone who also has a large degree of respect for poetry/a degree in English). I usually think that Yahtzee is spot on with his criticisms, but I don't think that getting hung up on Child of Light's lack of iambic pentameter or strange rhythm is one of his best critiques. He's perfectly entitled to his own opinion, but I'd just like to counter with my own view: Child of Light's story, music, art style, and game mechanics all work together cohesively and compliment one another to create a very great experience that I expect will be remembered as a classic. Yes, the poetry isn't grade A, but it is a small issue compared to the immense amount of good the game provides in terms of story, powerful female characters, and an RPG battle system that can appeal outside of traditional RPG audiences.
At $15, I'd recommend you give it a shot.