Another naming disaster! Opus is better than sonnet? And sonnet is better than haiku? Perhaps this makes sense to people familiar with sonnets and haikus and opus....es? Nonsensical to me! I know everyone loves to hate on Google, but at least pro and ultra have a sort of sense of level of sophistication.
I think the intention was more "bigger" than better - but opus is an odd choice. haiku>sonnet>ballad maybe? haiku>sonnet>epic?
dang; missed opportunity.