For Panzer Tactics, I can totally see that.
It's a real man's war game, not yo' candy-ass Advance Wars or Age of Empires: Age of Kings (I played all three, so I feel that I can make this horribly biased statement. Never fully completed all of them), it's what tactics and warfare are all about: Precision strikes, planning (Dear God the planning...), artillery support fire, bombing, statistics, more planning, tactics, slow-paced gameplay, trying to avoid a rout, and finally, planning.
To be fair, I only got past the first mission, as it was slightly overwhelming. It really is deep though.
For The Dark Spire, I'm not surprised. It's quite like Etrian Odyssey II but more brutal and masochistic.
But I'm not giving up! I believe in you Yut! Remember the Alamo!
Mystery Dungeon: Shiren the Wanderer, which some other forumites played.
It's an old-school roguelike, which means that this too, is a man's game.