I grew up with Inuyasha, Pokemon, Harry Potter and a few low-budget cartoons/movies like the Pagemaster. I've only just started to watch more modern movies in theaters that look interesting, like a Dog's Purpose, Star Wars VII, anything Disney/Pixar pumps out or something I happen to see while on TV like White House Down.
That being said, I did see some superhero things growing up, like Teen Titans and that awesome Justice League cartoon, but I wouldn't be able to remember any of the VAs off the top of my head as animation only lets you identify them through their voices or in the credits. I think the only mainstream actor I really was aware of for a long time was Anne Hathaway due to her role in the Japanese anime film "The Cat Returns". This is all mostly due to my odd upbringing but I'm slowly aware of some of the popular names, even if I haven't watched most of the hit stuff my peers did (Still never will see LOTR due to how long it is, or Titanic for the same reason outside of bits of the ending I caught on TV once)
But as long as the VA they pick for Pikachu sounds fitting for a detective and works fine, I won't mind who it is. It could literally be anyone skilled at the role and I'd be happy.