I don't understand why people would review their own stories under false names. That's just weird! I know reviews are nice and make us feel good about what we've written, but writing is supposed to be enjoyable and not a popularity contest (in my opinion).
After reading about the star system, it sounds like getting rid of it was a good thing. People can be nasty for no good reason. Why would someone leave a good review and then give it one star? Jealously maybe?
As for signing up, it only takes a minute, so there is no need for guest reviews. I also don't get why someone would leave a nasty review as a guest. It's really cowardly.