It’s not an art preference. The most important factor is the amount value, which defaults to 0.5, which should be equivalent of 180° shutter, which most of the movies are shot with. You should never under any circumstances use 1.0 if you don’t want your visuals looking like crappy soap opera. 360° shutter is also known as shutter crime, and makes things look just nasty and smeary. You can go lower than that though, like 0.25, which would simulate shorter shutter time, but you may end up with a motion that looks choppy and strobbing. Generally, unless you really know what you are doing, leave it at 0.5.
Max and Per Object size are error correction parameters used to limit motion blur in certain cases to alleviate visual artifacts at the expense of motion blur accuracy. Unless you are seeing some significantly distracting motion blur artifacts in your project, then there’s no real need to touch those.
There’s quite an issue of game developers in general often not understanding cinematography, and therefore motion blur, and then overkilling it with things like shutter crime, or sometimes even worse, arbitrary motion blur values without any real world camera physics basis. Such approach then most of the time leads to ugly, unbearable motion blur which is the very first thing player turns off in options the very first time they launch the game.