Yeah, it's difficult, and I have to admit I don't often bother to provide ratings or reviews, either, for games, books, movies... and there's some much content out there it's hard to command anyone's attention for long!
That said, one thing I suggest if you're not doing already, is make a concerted effort to provide feedback on other people's projects and hopefully they will reciprocate. I like to say that networking is not just about asking for help, it's about giving it. I often receive requests to retweet or follow or blog about someone's project but if I look on their feed and see they only talk about their own project I don't feel any obligation to spend any time on them. On the other hand if they're actively helping others it seems like a good cause.