I think it's like the scene between Peter and Uncle Ben in Spidey 2 (Raimi)
The scene of Pa Kent in BvS I accept I never expected him to be here and, honestly, but if you think about it, it's one of the scenes that made more sense of the film.
I think it was perfect moment as we saw clark lost and looking for answers, what better than his dad answering them. My point of view tho.
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As for the Martha thing... I think we didn't need too much of it because:
First: This was an introduction of Batman but we knew this by the multiple times we have seen it in different media, and this was a movie with Superman into the mix. There were enough elements (people knowing how much Bruce loves his parents and all the background people have on their minds, make at least to us fans who know it and even general audience to FEEL that scene) I bet if we have more things of it, people would have complained: But we knew that, why they spent so much time on this while other things needed to be explained, I bet on it :funnny:
If you tell me this was a batsolo (even there too much of the Waynes, thing that we already know really well) then I would give them a point but no, here there was enough balance between the 2 (you know the Martha needed to work on the other side too and Cavill was perfect there with the emotion to make Bruce feel like he just was a guy, superpowered, trying to save his mom. That was the connection and if they didn't feel it, well... IDK what to say to that, the majority felt it and very MUCH, from what I've been seeing and hearing in multiple places (not only internet ones).
I think IMHO, that the scene was touching because IDK, we as sons and daughters have an special bond to our mother, and we DON'T NEED an EXPLANATION for that to FEEL it. At least not in my book. And if you add our knowledge of that scene that was done MANY and MANY TIMES AGO, I think that was so powerful, at least to many of us. I would say this is nitpicking just for the sake of nitpick, IMO of course.
Another thing. while it wouldn't be as touching like with his mom but would be the same case, is if the case was that both their dads were named Jonathan or Thomas, as Bruce loves his PARENTS SO MUCH. Or people that didn't feel it, maybe didn't have enough knowledge besides TDKT (not explored as well as this IMO) as many of us have in the comics.
What made the scene really TOUCHING was these things:
We saw Bruce SUFFERING and SEEING while BOTH of their parents tried to protect him, add that the fact about Martha's love for Clark. Yeah all those things made it a really EMOTIVE one.
However, who knows, maybe we get to explore more of that relationship (as it should be, in a solo movie) in the batsolo, but I hope it's not as big as some want. I think we don't need too much screen time to acknowledge it for what it is. or maybe we get an extra scene as part of those 30 mins. We will see.
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Sorry for the off-topic.
As for Jonathan. It was superb that scene. The dialogue, the feeling, wow, it was awesome. This Jonathan has more deep that we gave credit for.
I always have seen this version as the most human of all Pa Kents. Not to mention the most wiser, always having the best answer in an IMPARTIAL way to teach his son the best but LETTING HIM CHOOSE in the end. and always wanting the better for his son. Again, this is my perception.