How does Scan.co.uk and other websites rate cases/chassis?

not too sure about scan

use them a lot and no problems with them

but have seen them rate some things with less than 3 out of 3 stars that were excellent items

i like sites like aria.co.uk where users review and rate the hardware--their staff will also answer any questions you have

as well

i also use and have had no problems with ebuyer,dabs,novatech,overclockers.co.uk,tekheads

what makes a good case?

airflow,how loud,cable management,build quality,looks--though that ones subjective to what taste you have