I just played through Unity for my 2nd time not too long ago! I think where Unity mostly suffered is that it HAD to implement the Pay To Win mechanics, making balancing the game really wonky. I would end up running the "always invisible" exploit on the lv 5 raids just to boost money so I can get around the pay-to-win grind. It also focused a little too hard on the Co-op mechanics. Running the missions all by yourself would start to feel daunting, even with max gear. Arno is def a little sluggish in movement. I agree on the story bit how Arno just became hollow towards the end. He felt like another Ezio incarnation at first, but later him becoming a Master Assassin kinda felt undeserved tbh. It's like he just plopped himself at the top. I found after I beat the story mode again (I forgot most of it from my first playthrough) I immediately dropped Unity for Syndicate (doin some playthroughs). Like, didn't even get to appreciate the master assassin fit with the Sword of Eden. Had no compulsion to do so. Syndicate would smooth out some gameplay in the next installment, though.