Three quiet tests: could someone reasonably argue the opposite? Does it ask for evidence from the text? Is it specific rather than general?
Still finding its feet
"Wuthering Heights is about love and revenge."
Getting closer
"Heathcliff's obsessive love destroys everyone around him."
Worth arguing ✦
"Brontë suggests that when love becomes a person's highest good, it ceases to be love at all. Heathcliff does not love Catherine too much — he loves her wrongly."