Thief II i liked best, aldo Thief 1 comes after II closely. Only reason i didn't enjoy the cave/monster lvl's that much. It doesn't compete whit the atmosphere, you know, of being a Thief in a human world. Aldo i do recognise the issue's whit Thief III, it didn't spoiled my fun; i never used the "transporters" to flee from the guards; the guards went down before that. I have a habit of knocking them down, sneaking up on them. Tricky, some times; but most of the time do-able.
Thnigs like hidden switches, codebreakers, and things like the garagedoors, to find the code; is just what makes Thief strong; i love it. I don't mind walking the same path a few times more; that's quite natural. You do it all the time irl; so why bother now ?
Anyway, you took the long route; you could do it much easier; as is pointed out to you; shade.v2 ;-)