Both Arena & Daggerfall are essentially infinite dungeon crawlers. While Arena had minimal lore and a linear main quest that gets very repetitve, Daggerfall had an intriguing, multi-pathed main quest and a fully fledged out setting with tons of (non-censored) lore books spread around.
Morrowind is a small-scale, non-randomized and much less complex version of Daggerfall. The only thing it does better, is atmosphere.