What is your personal review system?

[SamuelRSmith]

It's better than:
It's worse than:

If it's better than a similar game that I already own, I'll pick it up. If it's worse to a similar game that I already own, I won't pick it up.

Of course it doesn't always directly pan out like that, otherwise I'd end up with very few games that I'd be very bored with.