Well, the Room of Three Torches was entered from below in "The Helmet of Genghis Khan" and "Alexander and the Gordian Knot", but yeah the objective was rare and lame.
The best lower center shaft room is the Laser Light Room. Both Throne Rooms were lame, the Room of Harmonic Convergence was broken half of the times, and the Tomb of the Headless Kings was too time consuming. The Laser Light Room was a nice mixture of difficulty and I liked the atmosphere of that room.
The lamest room to the right of the Shrine was...