The enviroment in riven are some of the best ones ive seen. but it was way to hard for me, so i played it with a walktrough but still loved it
also myst 3 got good reveiws but i didnt particuly like it. im currently playing myst 4 at the moment and its ok, really nice graphics, but i dont really like the enviroments in it. and some of the puzzles are pretty hard, but thats normal for myst games.