Somehow...I love it!
The basic idea is that you start of as a god who has "appeared" to save a little child from the sharks in the water, the parents of the child take you to an unfinished temple they have made for you (quite strange, because you didnt exist when they started the temple), you then help them finish it, with a little help from your good and evil conciences, who are funny little chaps who always seem to be talking in your ear. You then do a little quest to get your creature which you choose, an soon after you are plunged into a quest to destroy an evil god called nemesis.
The thing about Black and White is that it has flaws, but it rather sneakily charms you into not noticing them, for example, there is only 5 levels in the storyline, and not much skirmish gameplay. But the fact is you can try it over and over again to change how you raise your creature, and explore things you never explored the first time.
Now that it is old and cheap, if you dont have it, get it!