I make my own equipment, so all the in-game stuff is basically just a collectible - but I actually enjoyed the Gauldur quest storyline and reforging the amulet, so while I never wear it, I consider it to be a favorite jewelry item in my collection.
Same here; even though the reward was pitiful compared to my custom items, the way the quest unfolded made pursuing it worthwhile. I did feel it could have been a bit longer, given that these are supposed to be Artifacts of Ultimate Power?, but under the circumstances any extension would have just been padding.
Well, it's not so much that I always want more... it's that I would like a proportional reward. For example, I think the Mace of Molag-Bal is TOO strong for what you have to do to get it. The Gauldur Amulet is not strong enough for what you have to do to get it.
I also agree with this, although in a broader sense: some artifacts are more worthwhile to pursue than others, usually because they have a better story behind them. I found the Molag Bal quest wholly unsatisfactory, and could see the 'surprise twist' coming from miles away, while Meridia's quest would still be worth doing with a lesser reward.