for example games like lost planet 2 or hawx2 could tell you that gtx has a superb power/performance ratio compared to radeons which isnt true. This is what i call biased and unprofessional, since adding those 2 titles heavily swings the results in one direction (while 99% of games would tell you otherwise).

Reviewers should avoid such situations imho, since its misleads normal users that don't have proper it know-how.
Hardware canucks show's highest playable settings for all hardware.