The problem with “Mom” is it has that mawkish, signature-Garth over-sentimentality that just makes you want to vomit. Are the words themselves terrible? No. But the lyrical payoff’s potency is good for about one pass of the song, if you can’t see the “Mom” hook coming from a mile away, which most listeners will. Today we’re too gripped with irony and sarcasm to let something so sappy and direct resonate widely.