I've gotten some Useful votes on my reviews that received an overwhelming majority of Extremely Useful votes. I've even received a Useful vote from people who effusively praised the review.
After receiving a Useful vote, I always go over my review AGAIN with a fine-tooth comb, wracking my brain for information that I could have possibly left out or for information that I could add that would make it more useful. I am very, very meticulous and, before I submit my reviews, I try to include any bit of information I can think of to help the customer make an informed decision on a product. I take photos and I thoroughly measure the product to give additional measurements that were not provided on the product information page (for example, the height of the raised texture and the diameter/circumference of both the head AND the shaft, which is not provided on the product information page).
I give it my very, very best to go above and beyond when I write each review by spending a minimum of three days on each one -- just so I can make sure that every single thing I can think of is included, that there are no grammar errors, and that the sentence structure is easy to follow.
Yet I still get a handful of Useful votes (I think I've gotten four Useful votes between all of my reviews so far). I honestly do not think there is anything you CAN do to ensure an Extremely Useful vote every time. I just keep in mind that I write my reviews for the benefit of the customer and do the very, very best job that I can do for each review. The fact that I KNOW I did a bang-up job on my reviews is the best reward in itself. Praise is always nice, but, in the end, it really does not matter what others think as long as you know you've gone above and beyond and given it your best.
