They did noticeably abridge/skip fights to cram in more story. I guess it was a decision to make it more narrative than action. The nerfing of Luffy and Zoro probably makes it a tad more realistic and a bit less cartoony.
I agree that the fishmen didn't look great and I'm a bit concerned about what they're going to do with Chopper.
But tbh if you're truly bothered by inconsequential details like Usopp not having a long nose (which would not translate well to live action), this definitely ain't the show for you.