I'd say it depends on the optimization level. if we are at a very high-op table where all feats are either required for something or give you amazing abilities or multiply stuff, then it's garbage. at very high op you don't roll saving throws anyway, as most enemies won't give you the benefit of one. you defend by breaking line of sight / being untargettable /being immune at those tables.
but for a mid-op table it is a fine feat. not the "must have this" kind of feat, but the "this is useful if i have no pressing urges" kind of feat.
also on npcs. if you are planning to use many npcs on an encounter, giving all them peculiar stuff to do is complicated. it's almost guaranteed that you'll forgot most of it.
on the other hand, with their lower wealth npc often have troubles hitting the heroes.
so, that's where you want feats that increase numbers.