Love: While his crew interactions and his personality has been slightly flanderized, which is something that bothers me, I think Zoro is always fun to watch. I miss some parts about his earlier arc characterization, but not enough for it to be a dealbreaker. I still think his stoic, disposition is something that actually mesh well with the rest of the Strawhats and in terms of character development, I think he's one of the better in the crew. There is a saying that characters are defined by their actions, specifically in pressed situations. Considering Zoro for much of the series has been through some of the most mortifying experiences in the crew, he's the one who's grown the most on this point.
All the way back from learning to cut steel ( a fight that I think might hands down be the best one in the series ), all the way up to thriller bark where he decides to sacrifice himself for Luffy really being the one thing that solidifed him. Some people argue that it's something that has been creeping for the entirety of the series, and it has, but I view that moment as the one thing that drove Zoro closer to becoming the not so funloving guy anymore. Around Dressrosa, I think he opened up a little bit more again. My guess is that his isolation from the crew and Luffy in particular, is the thing that made him be a little bit more coldhearted. Once he came back to Luffy, he would subsequently start goofing around a little bit more. Wano will definetly be one of the things that has him growing for real and I'm really excited to see what Oda decides to do with him. Zoro is obviously one of Oda's favorite characters and having been in the series for so very long, I don't doubt that Oda has massive plans for him.
Loathe: Zoro for all his strengths, is also a victim of circumstances. Being such an action ( not just in the sense of fighting ) oriented character, the moment his actions stop carrying heavy weight, he starts to stagnate. While it is a good decision for Oda to not constantly raise the stakes for ever single fight, because that could easily inflate the absurdity market: For most of the early One Piece, he was the character who got the most fucked up from his fights, surviving impossible odds and occasionally coming out on top. That made his battles very dynamic and we could see Zoro growing throughout it all.
However, around the time of the New World, due to narrative structure, we see just how lackluster Zoro can become when he doesn't have to overcome obstacles. Fishman Island was for all intents and purpose just a hype arc, it was meant to show us how much the Strawhats had grown. Zoro much more than any other, became a character who just steamrolled every single adversity he faced. First he beat Neptune with ease, then he defeated Hordy under the water and then he defeated that lame, octopus swordsman. Which is all and well, considering how Fishman Island was structured. Then we come to Punk Hazard, where there are also no real threats for the Strawhats and Zoro comes out on top once again. The whole thing about him not liking to strike women just became a plot tumor, that almost felt patronizing in a sense. While I appreciate that he in a much more grounded sense way a respect for women than Sanji do. His viewpoint feels a little misogynistic when he refuses to use deadly force against women who are a threat to his ( female ) crewmembers.
So for over 100 chapters, Zoro doesn't face a single important opponent, making him feel very stagnant. Then comes the bloated mess that was Dressrosa. Even here, his opponent, who's absurdly powerful, was just another hypetool for him to show off his moves. While Daizen Sekai against Pica is handsdown one of the coolest abilities we've ever seen used, a fight has to rest on more than just an awesome power. So now we have around 200 chapters where Zoro doesn't fight a single worthy opponent and then we get 20 chapters of no fighting at all and then we get Wholecake where he isn't even in. This becomes a pacing issue for his character growth. So for at the very least since before the timeskip, we have Zoro remaining basically static. Him bowing to Mihawk was the last real character moment we got from. While I like watching Zoro look good compared to his enemies, I think he looks far better, when he overcomes a dangerous opponent.
I'll withhold much of my judgement until Wano, which will undoubtely give Zoro a lot to do. And another thing, which is slightly minor, is the fact that we don't get to see all too many crew interactions when they're just dicking around on the boat. Which is a place where Zoro really works well. He is after all, the Blue Oni to Luffy's Red. Much of their dynamic together, and Zoro working as Luffy's advisor when it comes to making harsh decisions is one of the things that adds to him. And I love watching him bicker and fight with Nami and Sanji. There hasn't been enough of that as of late.
Character: 3.5/5, there are things that has to be improved about him, but I really enjoy his presence in the series. He's one of the most iconic characters in One Piece for a reason.
Design: 4/5 Zoro's rugged handsome aesthetic and unique features, like the three earrings, his haramaki, his green, short hair ( which was in the late 90s a very unusually hairstyle, when most Shounen authors just tried to up the ante on the absurdly spikey hair ) makes him memorable as it is.