The phrase "mindless shooter" refers to a video game where the primary objective is to shoot enemies without requiring much thought or strategy. Full definition
I guess people here like mindless shooters more.. (nintendotoday.com)
While the relatively mindless shooter games attract a great deal of negative press, many of the most popular games in recent years offer stimulating mental exercise, even if their narratives sometimes leave a little to be desired. (discovermagazine.com)
If you missed out because you either didn't exist yet or were too preoccupied with the business of filling up your nappy to be bothered by such trivial pursuits as video games, you'll recognise it as a landmark title that still has a huge influence on the genre, but probably enjoy it as a fairly mindless shooter that'll keep you occupied on the go. (gamesradar.com)