I was writing reviews for nearly a year before I used the Standard Format regularly. I now prefer it, although I usually go over the word count and need to edit the review.
In fact, I do a lot of DRs for the product pages, and I get frustrated because you must do DRs in Extended Format. I would rather do them in Standard, because I can write it up first on my laptop in Word and just copy and paste onto the review. I find myself repeating myself with the Extended Format and I get really frustrated. But the Product Page is set up in Extended, so we have to do the Descriptive Review this way. I rarely run out of room in Extended Format, though.
I think until you have a lot of reviews under your belt and a lot of experience, the Extended Format is the best way to do it. EF prompts you so you don't forget things, and also helps with the flow of the review. Once you get your confidence a a lot of experience (I found a year of writing reviews was when I needed the Standard) you may like Standard.
Although some things (like I believe lingerie) only let you write in Standard Format. You could write in in Word in Extended and then edit it to fit into the Standard Format when the review requires it, if you like. That might help you coalesce your thoughts and then pare it down to fit.