U9 wasn't a total dissapointment to me. It was better than U8 but failed to live up to the gameplay and world simulation of U7. I also didn't care for the rinse/repeat action of purifying each dungeon. Still, I thought it was an interesting world to explore with a few secrets peppered here and there. Combat was poor and magic, while interesting, was a bit cumbersome to rely on.
Like what has already been discussed to death, the plot is flawed from a canon perspective and from just the U9 perspective, lacking and inconsistent.
But I still regard it as worthwhile romp and play it on occassion. I just wish, after nearly 20 years, there was a new Ultima that would make U7 look like child's play.
Gothic's 1 & 2 actually rival U7 (and I loved playing each of them), but both those games still lacked in the object interaction department.
Ah well, I'm rambling...