I love One Piece, although this is not as forgettable as the other films, this certainly isn't among the Top 5.
I've seen both positive and negative reviews. For the positive ones, I think they're blown way out of proportion. This is unique in its own right but no way groundbreaking. Meanwhile, I understand the negative reviews and maybe this just isn't for them.
I don't think you'd miss out if you skip this movie. Honestly, I watched it because of that Zoro meme on the boat, but otherwise not a great loss if you haven't seen it (I saw all the movies from the Great Gold Pirate until Red, so I think I fairly know what I'm talking about).