JarlFrank
I like Thief THIS much
Anything released before 2018 is quite rough, and the TR team is working on overhauling all of it eventually.Telvanni have lots of quests, but consider it "legacy" content.
Consult this release map for reference:
Old Ebonheart and anything south and west of it is excellent, as is the reworked coastal western Telvanni area from 2022.
My suggestion for newcomers: go to Andothren, go to Old Ebonheart, and go to Firewatch. Talk to NPCs, get a bunch of quests, and just go with the flow from there.
The area they're overhauling for Poison Song is pretty bland right now. The Mephalan Vales area that was released in 2012 is rougher than the newer stuff, but it still holds up well enough. Has some excellent dungeons and a city or two with good quests. The Sacred East expansion - the 2008 area - is the least developed from my experience. Much lower content density when it comes to dungeons, and also much fewer quests. Necrom is a cool place to look at but doesn't have a lot going on in it. They'll eventually overhaul it.
Anything in the 2018-2023 releases is absolutely excellent and some of the best RPG content I've played in 20 years.