Oh yeah, let me be clear, I think they did a great job with Frog since I think the voices and dub seems to fit a lot better. There was a much better flow to the dub for Frog than it was for Shinchan.
And I was OK with how they played the references and changes for Frog, but all the Gundam stuff is still in there.
To me it was just annoying in Shinchan, when they had this little Republican kid making all these stupid Republican jokes, "Like I left my precious sticker next to my leaflets for the Impeach Hillary Campaign!" BLURGH! Durab, forced jokes. Like comedy writers who write BAD comedy.
For Gintama, I think they would have to find some kind of comfortable balance. Like all the word play jokes, all the Japanese culture references to television and what not, people aren't going to get any of those. So those would all have to be changed.