Yep, I've beaten lots of average games in my life. F1 Race Stars, Far Cry New Dawn, Halo 5, Batman Arkham Origins, Need for Speed Payback, NSMB2, Batman Telltale to name a few.
A game that's like a 7/10 can still be enjoyable, it really depends on how much effort the game is. Racing Games etc you can kind of just turn your brain off and go through it. I think it'd be harder for me to finish a 7/10 or less game like an RPG, Puzzle or anything that requires a lot of attention and time.