I can't really offer a good answer to this topic, seeing as I've never played past Omen's Test.

But from what I've seen, it's pretty good...I've learned enough from the webboards to know.
Although yes, there definitely are better RPGs, such as Nethergate, Realmz and Chrono Trigger. Those are cool. But, as cache22 pointed out, Cythera is a good world for basing stories in. Nethergate's plot is more or less set, since it's based on a Roman/Celtic war, although the characters would be good. Realmz, as I recall, is more or less just your basic RPG, and although it -could- be used for stories it's too varied. Not enough to base it on. Chrono Trigger could be interesting for stories, but the characters are too set. You can change the name, that's about it, so having your own characters wouldn't really work.
So, as far as I can tell, Cythera certainly isn't the best RPG, but it's perfect for our purposes.
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