“Of the 1,431 games released last year that garnered more than 500 reviews — an indication that they were played by at least a few thousand people — more than 260 were rated positively by 90% or more of the players. More than 800 scored 80% or better.”
Problem - You can’t trust Steam reviews. Steam users will give top ratings to “Click the Duck”.
Current gen games can’t be played from standard external storage. You could put the game there, but it would have to be moved to internal memory to play it.