I think it’s worth mentioning that the games got a fully fledged prequel with “Thief: The Black Parade” in 2023. It’s a total conversion mod of Thief 2 that is so well made that it’s basically a new game. I can really recommend it. I think I even liked it more than the base game

It’s been ages since I played it, I don’t remember that it gets better. I should have listened to the reviews back then, because they all said that it was generally very easy and might bore more experienced players.