Since everyone's still arguing:
Chinese grosses are great for boosting those Worldwide totals to impressive numbers, but studios only take 25% of the gross from China, and ancillary revenue is like 10x lower than it is domestically (though that situation is starting to improve). $90M of domestic gross is about the same as $200M of Chinese gross, not considering any other revenue but box office. If you factor in everything else, it's probably closer to $50M domestic (or $60-75M in Europe) is as good as $200M in China.
Civil War and Age of Ultron were by far the two biggest comic films in China, and even in those cases, we are talking about another $45M and 60M going to Marvel Studios respectively (Marvel's theatre cut outside of China for those two films was about $450M for Civil War and $525-550M for Age of Ultron). As such, I think you can mostly discard China when trying to get an idea of Superhero movie success. At best, it bumps the worldwide theatre cut by 10-15% and the ancillary revenue cut by 1-2%. Often less.
Also, China has only been a significant part of worldwide superhero grosses since 2012 (with $90M+ grosses becoming frequent in 2014). Setting it aside provides an apples to apples comparison to anything released earlier.
Below is a chart of every comic book Superhero film (minus the super low budget stuff) released since the MCU started. Each film is listed alongside their worldwide gross without China inflating things, their reported budgets (some of these differ from what is listed on BOM if we got clarifying budget reports after the film was released), and their gross to budget ratios.
Suicide Squad is listed at the bottom along with an estimated final gross range based on current trajectories.
Code:
Title Worldwide minus China Reported Budget Gross/Budget Ratio
Avengers $1434M $220M 6.52x
Avengers: Age of Ultron $1165M $265M 4.40x
Iron Man 3 $1094M $200M 5.47x
The Dark Knight Rises $1032M $230M 4.49x
The Dark Knight $1005M $185M 5.43x
Captain America: Civil War $962M $250M 3.85x
Deadpool $783M $58M 13.5x
Batman v Superman $777M $250M 3.11x
Amazing Spider-Man $709M $230M 3.08x
Guardians of the Galaxy $677M $195M 3.47x
X-Men: Days of Future Past $632M $200M 3.16x
Iron Man 2 $616M $200M 3.08x
The Amazing Spider-Man 2 $615M $290M 2.12x
Man of Steel $605M $225M 2.69x
Captain America: The Winter Soldier $598M $170M 3.52x
Thor: The Dark World $589M $170M 3.46x
Big Hero 6 $574M $165M 3.48x
Iron Man $570M $150M 3.80x
Thor $449M $150M 2.99x
X-Men: Apocalypse $420M $178M 2.36x
Ant-Man $414M $130M 3.18x
The Wolverine $374M $120M 3.12x
X-Men Origins: Wolverine $373M $150M 2.49x
Captain America: The First Avenger $371M $140M 2.65x
X-men: First Class $354M $150M 2.36x
The Incredible Hulk $254M $150M 1.69x
Green Lantern $220M $200M 1.10x
The Green Hornet $208M $120M 1.73x
Watchmen $185M $130M 1.42x
Fantastic Four (2015) $168M $120M 1.40x
Hellboy 2: The Golden Army $158M $85M 1.86x
Ghost Rider: Spirit of Vengence $133M $57M 2.33x
Suicide Squad $700-730M $175M 4.00-4.17x
Without getting into bullshyt about super high marketing above and beyond all of these other films that had ubiquitous marketing efforts as well, how can one justify Suicide Squad not being a success, given the stats on every other film in the genre? Even if the reported $175M budget was under by $50M (making the film $225M), Suicide Squad's gross to budget ratio would still be in the >3x MCU range on that low end $700M gross.