This is an enormously important game, even if it's far from perfect. Like
other reviewers here I have mixed feelings, but for different reasons.
The good: preserves the good things from the first game; the UI is greatly
improved. It's much more effective and exciting to train non-Jedi members of
your crew to become Jedi than it's usually given credit for. Above all, the
dialogue, and interactions with other characters generally, is astonishingly
sophisticated, enormously involved, and has very important effects on the game.
It is outmatched only by “Planescape: Torment”. This is a game where you
save before a major conversation just like you save before a major battle.
The bad: the designers aimed for a complex, convoluted, psychological plot,
more about your character than about the fate of the galaxy – a sharp
contrast with the first game – and it kind of works, in places; but towards
the end everything just devolves into confusion, and the moral aspect vanishes
altogether. The final episode, especially, is the most criticised part of the
game, and is a complete anticlimax.
It's a good game. It's worth playing. It's really worth playing.
But it's not worth re-playing. When you start over, you know how messed up
it's going to get; there's no incentive to persist. In view of this, is it
worth the price, to play through it just once? – maybe, maybe. The good
points are really good.