The number of reviews thing isn't how many reviews the author has received but how many they've written. If you want to read the reviews for an author's works, the easiest way of doing that is to go to their story page and scroll through. Generally, any story with stars attached has reviews. Keep in mind that stories without reviews aren't necessarily not good, they just didn't have readers who bothered leaving reviews; not everyone feels comfortable doing that. As for what reviews people have written, it's actually pretty easy to find. Click on 'See their activity'. You'll get a sidebar where you can choose the type of activity, and there you can select 'Story Reviews'. You can also see all story comments a member has made, and any stories they have beta'd or edited.
As for About Me sections, that's something all members have. You don't necessarily learn anything about an author's work from that. Honestly, as with books anywhere else, the best way to figure out whether you'll like an author's work is to read it. Find a blurb that intrigues you. Give it a chapter or so. If you don't like it, stop reading. And as opposed to other books, here you don't even have to buy it to find out. Personally, it takes about five minutes of my time to figure out if a story is for me or not.