2.  Batman vs Superman will make a ton of money, but still disappoint expectations.  
BvS  will basically be a scaled up MoS:  somewhat better reviews ( high 60s,  probably ), somewhat better gross ( breaking a billion, or coming near  enough ).  However, WB is expecting bigger things from it, Avengers  numbers.  Not reaching that level of either critical or box office  success will leave them in an awkward position- none of the worries they  have about their own path will actually be resolved, but its not  actually a failure, so they can't really justify changing course.  The  result is that they forge onward, but with the same lack of confidence  hanging over WW and JL that was hanging over BvS.  This raises the  stakes for WW especially:  without the confidence boost of a definite  success on their hands, I suspect they will be a lot more unforgiving of  any stumble by their "risky" female-led movie.
Fan reaction,  meanwhile, will be split between declaring it the Best Movie Ever ( and  you shall burn if you disagree ), and looking for a scapegoat in the  movie for why it sucked when it shoudn't have.  Odds on bet for that:   Jesse Eisenberg's Lex Luthor.