Films that didn't need a riffing?

[Trevor]

My vote goes to KILL AND KILL AGAIN.

The film was funny enough as it was already.

[bob]

Hobgoblins 

[Trevor]

Hobgoblins 

Indeed 😀😆🐢

[Rev. Powell]

Riffing PLAN 9 and THE ROOM were almost redundant and kind of watered down the experience. Other than those two classics, however, I think every movie benefits from a good riffing. I would not really want to see HOBGOBLINS on its own. Thanks but no thanks.

[claws]

Pretty much every 'legendary' bad movie doesn't need riffing.

The Room: Tommy Wiseau's surreal line deliveries and baffling plot turns already feel like a live riff track.
Birdemic: Shock and Terror: The CGI birds, the sound glitches, the acting... it's self‑riffing cinema.
Troll 2: A legendary disaster with unforgettable "they're eating her!" energy.
Plan 9 from Outer Space: Ed Wood's earnest incompetence is already the joke.
Samurai Cop: Dialogue, wigs, continuity... every frame is a punchline.
Miami Connection: Ninjas, synth rock, friendship speeches, riffing would only interrupt the magic.
Battlefield Earth: Dutch angles and overacting make it unintentionally comedic on its own.
Batman & Robin: Neon excess, ice puns, and toyetic chaos already feel like parody.
Howard the Duck: A bizarre tonal mess that's already absurd enough without commentary.
Catwoman: Hyperactive editing and baffling choices make it unintentionally hilarious.

As for Hobgoblins. It's just flat-out bad with zero redeeming values. Or, at least I couldn't find or see any. Nothing memorable, nothing quotable.
It was literally a pain to sit through. But then again, people say the same about Troll 2 or Showgirls so, each to their own.