When I first saw this I got a bit excited. The more I dug into it I began to think it's all about Amazon affiliate links.
Even if these kinds of sites are well-intentioned, they're often out of date or incomplete. Case and point: my personal Lenovo favorites are not even mentioned.
The ratings are based on compatibility:
5 stars ... fully compatible (plug and play)
4 stars ... some configuration needed (e.g. change some conf file)
3 stars ... heavy configuration needed (e.g. compile some drivers)
2 stars ... hardly usable under Linux (e.g. limited functionality with high effort only)
1 star ... not usable under Linux
0 stars ... not yet rated due to missing test results
There's so much friggin' hardware out there these days - I guess the site may be helpful to some. FWIW I'll stick with h-node.org - been using that for some time now and it hasn't let me down.