I only have the original Morrowind Elder Scrolls III for Xbox. How good are the expansion packs? Worth buying? 'Cause I'm almost done with the first game, but like with any good game -- I just don't want it to end!

If you have nothing to play currently, then the expansions are worth buying. There are quests to be done in the expansion which will mean more game time.

I'm also unsure whether to buy it or not on Xbox. Are the expansions big enough to be worth 80 bucks?

the first expansion give you this big but empty kind of feeling. the quests there is rather short. The second expansion is a bit better because there are more quests to be done.

Tribunal wasn't too bad, but since its Xbox the city will seem big, but short of people...sale at Penny's. With the PC version there are mods to add people to towns and cities. Haven't played Bloodmoon yet, but I have it.