As usual for aggregate-content sites, unless the site is better than EVERY other content in SOME way, and ranks with the top sites overall, then we probably won't list it. As the number of such sites, failed and failing, grows, we can't afford not to raise our standards. So many sites we listed in 2000 might be removed instantly if re-reviewed, and many of the sites listed in 2002 wouldn't be listed today. Back then, there were more niches available for unique sites, and for a unique concept we'd allow less content.
You can, of course, search the internet to see how unique your concept is.