I have to agree theres a bias.
For example DC introduces WW into BVS and people call it overcrowded.Marvel introduces Panther into Ironman vs Captainamerica and its brilliant.
DC releases a Film slate and they say its rushed and meaningless.Marvel does the same and its brilliant and well planned.
Marvel releases AOU trailer that takes is darker,serious and has destruction.No one calls it a dreary,disater porn trailer.
Just random examples.
Now to be fair.This is justified bias looking at WB/DC trackrecord.But bias all the same
Also, the DC slate was one revealed primarily to woo investors, it wasn't the focal point of a Hall H-style downtown media event.
The only real foundation current anti-DC/WB bias has is that Nolan's trilogy isn't part of the new shared universe, because two of those films have grossed one billion dollars-plus.
Nobody minded the introduction of a flood of new characters in GotG. Also, Hawkeye will likely play a part in Captain America: Civil War, so anyone who complains about the introductions of Wonder Woman, Aquaman and Cyborg (who will only get a fleeting appearance) in BvS is exactly that: a complainer. And for all the criticism Zack Snyder gets, Thor: The Dark World and Iron Man 2+3 are not examples of extraordinarily fine directing. MoS is easily better than those.