Well I was about to mention ULTRAKiLL but you mentioned this was in regards to casual titles. In which case I for the most part agree.
I'll be honest, despite having played shooters of varying sorts for years, I have no idea what gunplay actually means and what "good" or "bad" gunplay is.
The game design of behind the usage of guns in video games
>mix of movement, blocking, attacking, maybe even dodging, and some projectiles in some scenarios.
Old dooms had these all besides blocking
Most pre halo/cod shooters had those in general. The ps3/360 era of shooters did a number on the genre. I'd say it's better nowadays but beyond the Doom reboots and the resurgence in boomershooters made by indie devs the genre is still in a shit state now most AAA want to make hero/looter shooters or battle royale shit.