Too many sprawling corridors more than balanced by some nice level layout/level puzzles, the test your strength part and evil fights.
Very different level layouts, and the 'test your strength' areas to earn keys instead of exploring great idea.
Some tough fights around.
Good sized dungeon, though I felt it sometimes ditracted having to walk around so much!
Kind of a kicker when you get to the end and realize you have left half the keys higher up in other levels!
Playing the cemetery of the dead etc level - I just really loved it... The end levels were cool too to fight through.
Walking around so much testing walls and forgetting which way I came half way down a corridor.