Sometimes, The Simpsons is simply exhausting here in its late period. What, exactly, was “Love Is a Many Splintered Thing” supposed to be? Can anyone tell me? Because all it felt like was a mess, unfocused and boring. I guess we’re supposed to take it as a riff on romantic comedies, just in time for Valentine’s Day, what with all the “Love Indubitably” and the Woody Allen mockery, but on that level, it mostly just points at familiar references, expects us to laugh, then moves on without playing with or commenting on any of it. And sure, maybe seeing Lisa done up like Diane Keaton in Annie Hall was fun, but I wish it was doing something.