The way I see it, investor shouldn't make investment decisions based on any one else's database ratios and numbers. Those should only serve as a way to help narrow down the search - once narrowed, you then have to look into the context and history and meaning of the ratios and figures to get closer what it mean given the company and all the context.
The narrowing down through available databases have its own downside, but since we all have forums to muck around on, it'll have to do for now. Best would be to go through entire listed stocks and see, but that takes work.
Point is, financial ratios are only pointers... even if the definition and the algorithm (formula) behind them are generally sound and accurate... its ultimate use, its "truth" depends on the company, the industry and a lot of stuff... to really give a proper understanding of the company's health and operations.
In other words, to make decisions based on some figure alone can get you into a lot of trouble. There's trouble of the good kind where the stock goes up - and it goes up for other reasons than what you believe it goes up for, in which case you keep relying on the figures for other decisions that might not work out as well; Then there's the trouble of the bad kind where the numbers are right but the market have its own reasons and you think the number is wrong and the market is right.
In short, it depends.
All the brokers and database guys would have been rich if they could make money from the numbers alone.