Most Marvel films come out close to or during Summer when Monday drops are usually not that steep. Doctor Strange (released in November) and The Winter Soldier (released in April) both had 70% drops. Black Panther had a very low drop on its first Monday, but that's because it was a holiday. Likewise for Batman v Superman, it was not only released on Easter weekend in late March (meaning there was some holiday spillover), but also benefited from a lot of schools having Spring Break around that time. It had a very good first Monday, but that ultimately didn't mean much for its final gross, which couldn't even double its opening weekend. That's bad even for capeshit. In other words, it's too soon to say where this will land.