It's not even remotely too late. Not that it matters, since Marvel and DC are not actually competing for audience dollars, as someone who watched Avengers:AoU opening week will likely be sitting in BvS just the same. Everyone here will likely be. Word of mouth after is what separates them with the casual fans.
Rarely will you hear something like "I watched Captain America, so I'm not going to watch MoS because of it." It's the same nerds in both audiences.