I used to do the 7-10 (or 5 to 10, I guess, with 5 being terrible, 7 average, and 10 great) grading scale as well but sharky pointed out that there are numbers before that and a 5 would be in the middle/average. A game above 5=above average and a game below 5=below average. It made sense to me what he was saying so I have moved away from the whole under 7=bad thing that I used to do

But yeah if you see my video game diary, I like most games I play as well! I am rarely disappointed and I rarely give up on a game or just end up not liking it

edit:
not to say the below 7=bad scale is wrong, if that's what you prefer, I just decided the other way made more sense to me personally