is there a way of reviewing products that are no longer for sale (dvd players,ect)?

for example like an archive section of WHICH or WHAT HI FI

Almost all manufacturers have an archive section on their website. You can download spec sheets, owner’s manuals etc.

I use them all the time. If you don’t readily see it, click on their customer service link. They are always happy to help.

Samsung BD-P1500 Blu-ray DVD Player Review