One of biggest advantages of Daggerfall are Dungeons during guild quests. Each dungeon is randomly generated when you enter and never show twice. As for it's age it was one of best and still is good game. A lot of funny mechanics that make game even more exciting when You save a lot additional enemies can spawn. If You like other TES games you definitely should try Daggerfall it's one of it's kind and got one of the best Main Story quest and you can visit entire Tamriel (it's really huge world)
