Haven't played Dungeon Master, so can't tell you about that. Legend of Grimrock is pretty enjoyable so far, but I fear I might get bored later. While dungeon is masterfully crafted, gameplay can get little boring as there is not much in it (yeah, riddles and secrets are great, but combat is repetitive, and it can get frustrating a little, some enemies are really, really tough). Im currently at beginning at lvl 6, playing with 1 warrior minotaur, 1 human warrior and 2 insectoid mages (one fire and ice, other earth and spellcraft). I didn't take rogue, cause there are not much weapons he could use in first two levels, but I may have made mistake as there are some really nice items for rogue later. Earth magic is not very usefull, to many enemise (all undead) are immune to poison damage. I will start to branch him out in Air magic.
As for tips. I don't know. Look everyone, even down the holes, because there are some secrets/items there. Save often. For skills, i recommend armor for warriors, and ice for mages(first ice magic can hit a lot of them in line, and frostbolt has a chance for freezing enemies). Take everything with you, especially rocks and throwing weapons, they are necessary for many riddles. Look at every wall for triggers, thankfully they always look same and are easy to spot.
PS: some mod should move this to videogames.