Unique, but without direction or purpose.
Like I said, it is a pretty unique RPG, mostly in the way your character is generated, and the way you progress and advance. You get better at skills by using them, as opposed to gaining a certain amount of XP. When you do gain a level, you get to increase attributes, and I am definitely a fan of the different attributes (stamina, personality I think is one), it is not the typical D&D rip off. Character development is a big plus for this game, as you pick skills that you are good at, and a few that are secondary. The cool thing is that there are different types of skills/abilities to select within the typical rogue/fighter/mage genre. Really, its not so much a matter of picking a fighter or mage as your "class", but the skills you pick determine what your character is like. You can pick long blades, alchemy, and mysticism as primary skills, for example. Such a character would be good with long swords, making potions, and using mysticism type spells. very refreshing, as I was used to picking the type of character first, then picking skills within that limited scope. The combinations of skills and race that make up your character are really limitless, and the world is HUGE. I can't think of a single game out there that beats Morrowind in terms of replayability value.
The negatives about the game, are, as mentioned before, the lack of purpose. While it is cool that you are not hacking u goblin after goblin trying to get to the evil end boss or whatnot, it also detracts from the gameplay, not knowing what it is you are after. I'm also not a huge fan of the races you get to pick from, but Morrowind does a good job of not giving you the same old dwarf, elf, or human to pick from.
To sum it up, the world is huge, and this game's strengths are its uniqueness and the size of the game world. I don't know if there is any way you could really see and do everything, and there are so many different ways you can build and develop your character. I really like that you can create your own spells (for example, I created a spell that did both lightning and poison damage) and enchant weapons. Overall, a very solid RPG, and I would definitely recommend this game to those who haven't tried it out, particularly if you are looking for an RPG with a big game world that isn't another imitation of Dungeons & Dragons.