I also hate the art style. I never liked it. It's offputing. Some styles put you off of shows. It looks like if you got a bunch of Egyptian New Kingdom statues and marionetted them around. It hits my uncanny valley reflex hard.
It's funny that you mention the artstyle actually. Two of my favorite TCW story arcs (the later seasons started doing 4 episode long story arcs that basically form their own movies when binged) are "The Bad Batch" and "Crystal Crisis" arcs. The Bad Batch is an absolute treat although it basically requires you to watch a bunch of the other clone focused episodes to get the full experience out of. It's incredibly dark and the reveal that
Echo survived the Citadel arc and what ended up happening to him is incredibly haunting. The Bad Batch themselves are also a fun group of characters
Crystal Crisis is just a fun romp with absolutely incredible banter between Obi-Wan and Anakin but it also has a direct tie in with A New Hope with the giant lightsaber crystal that the episode focuses on being strongly implied to be capable of being used to help power something like a Death Star Superlaser. I strongly recommend it. All you need to know is that Ahsoka decided to leave the Jedi order at the end of season 5 and as I'm sure you can imagine Anakin is taking it really well.
Both of these arcs were released as unfinished story reels (although Bad Batch is being finished for the Disney+ season 7 revival thingy.) They're fully voiced but the animation is incomplete, there are still placeholder models in some of the scenes, it's kind of a mess in terms of visuals, I mean look at this:
for BNMTCW's artstyle is kind of offputting for me in the early seasons because the animation just feels kind of sloppy between the early seasons being kind of rushed and the fact that the team didn't have the resources to fully realize the style they were going for but once George Lucas started throwing his own money into the project the animation becomes absolutely spectacular.
Rebels was always kind of "just there" for me in terms of animation. It has a style, it works, but while it has it's moments I never felt like it was as impressive as TCW was and a fair amount of that is that Disney unsurprisingly decided to have them work with a budget smaller than George Lucas's bank account.
To give context on my opinion of the prequel trilogy: Hayden Christenson is generally an absolute trainwreck as Anakin (although most of that is the writing and direction he got) and Jar Jar was a bit annoying in TPM although honestly it's more offputting for me to see him basically be reduced to a background character in ROTS because of the backlash he got than anything. Otherwise they're perfectly fine. I honestly prefer episodes 1 and 3 over The Force Awakens personally.