In addition to the above recommendations, also interesting puzzle missions (or at least partly including puzzles): King Abedzen's Tomb; Secrets of the Old City; In These Enlightened Times
I see you already played the likes of Beneath the Sands/Whispers in the Desert, Temple of the Tides, Forgotten Tomb and so on
Also one big environment puzzle of a classic mission of an entirely different kind: Thief: Brainchild
The presence of other...archaeologists is apparently meant to direct you to progress points they cannot use and that you otherwise wouldn't consider as your first option, and thus to trigger oh so unexpected (or obviously expectable) events one wouldn't deem possible - problem solved... Pretty funky design for its time of a different mould.
Just to clarify (or repeat myself):
"...that follow this trend make level design worse."
I actually didn't mean level design at all but all the possibilities in terms of assets, textures, colour depth, various effects, custom assets etc. that I believe T2 has against the original - the "full set" so to speak while T1 (again I may be wrong and very resourceful authors may prove otherwise if against the odds) only allows some (so why limit yourself).
As for the additional objectives, I...
It's not a bad mission, just feels a bit skewed against the player as most of the factions featured are antagonistic to each other but equally towards the player although by the story logic (as you are aiding the leader of one of them at his own request), at least one of them shouldn't, which combined with the overall gameplay length and having to traverse the entire compound top to bottom time and again tends to get a bit annoying. Good overall.
One valid criticism however that can be had...