I call them id-style shooters myself, but there is a bit of word play I like in the term 'boomer shooter'. On top of referencing the age of the audience when they first arrived (albeit incorrectly), it is also a reference to the fact that the optimal strategy for these games is simply to blow things the fuck up. There is very little tactical play beyond what weapons to use for a given situation, and these games really love their explosive barrels and rocket launchers.