The trailer for Avengers: Doomsday has sparked debate among fans, with some arguing that Marvel Studios rushed Robert Downey Jr.'s Doctor Doom into the spotlight without the multi-film build-up given to previous villain Thanos. Critics suggest this reflects Marvel's scramble for a compelling antagonist after plans to feature Kang the Conqueror were abandoned, questioning whether audiences will feel the same anticipation they did before Avengers: Infinity War and Endgame. IGN writer Wesley Yin-Poole counters that plenty of iconic villains, including Darth Vader and Ultron, succeeded on screen without lengthy set-up, arguing the film's success will hinge on execution rather than prior teasing.

Doom has appeared only once before, in a brief, menacing cameo at the end of The Fantastic Four: First Steps, compared with Thanos's gradual introduction across four films from 2012 to 2018. Despite the criticism, the trailer has generated strong early ticket sales and high viewing numbers, and the writer notes Avengers: Doomsday, out this December, may itself serve as an extended introduction to the character ahead of future instalments.