I knew immediately it was Atlantis 3, in my opinion it is the least interesting of the five in the series.
If you played the Mac OSX or iPad versions of Atlantis 3, that might explain why you thought it was the "least interesting." The Mac and iPad versions removed most of the puzzles and made gameplay areas much smaller (fewer nodes to explore).
IMO Atlantis 4 (Evolution) was by far the worst of them, with "Halt Deviant!!!" and "game over" every few seconds.