I can see how you would get bored with it, but there were a vast amount of games that I played at that time which were made in a similar fashion.
The Elite/Frontier series, Diablo, Mordor, etc.
So I guess I may be more attuned to it. I also played them as they were released, and in order, although I only ever managed to complete Oblivion! (the others are tough... too tough for me back then!) Arena
for me was the best, no preconceptions about what it was, just a really well made dungeon crawler.