Good point about Zagat. True, there's no granularity in the TripExpert Score. But at least you know that some factors aren't being weighted in an overwhelmingly disproportionate way like service (for example) is on TripAdvisor.
It is actually just the "standard" 5-star hotel rating scale. (I put standard in quotation marks because there isn't actually a worldwide common standard for what constitutes e.g. a 4-star hotel.) We've been wondering about whether it is confusing for people to display this alongside our own TripExpert Score. Sounds like you think it is?
Thanks for the positive feedback! Yes, we're building an API that will let other travel sites pull our scores, rankings and review extracts. If you or anyone you know might want to make use of it, tell them to get in touch! And, yes, we're considering other verticals.
Thanks for the feedback! Very glad to hear that you like the site so much. I agree with a lot of your suggestions, and some of them (like the filters automatically updating) we're going to be implementing soon. To answer your questions, it took about 9 months to build the site (RoR), although the majority of that time was spent developing a back-end that we use to manage all of the hotel and review data.
Yeah, I agree; in my experience, high-end hotels often get unfairly rated on TA, in large part because they often get a lot of negative reviews from people who thought that they were too expensive or offered poor value for money. They often end up ranking far too low.
FlyerTalk is a great resource, although you do have to spend a lot of time reading a lot of reviews. The advantage of an aggregator like TripExpert, with snippets from various sources all on one page, is that you can get a much better sense much more quickly of what a place is like.