I thought that D2 was a good movie, although some of the parts seemed to be unrealistic, and some main characters from The Mighty Ducks were missing. I missed Hans, though I did really like his "replacement". One of the bigger missing characters, I thought, was Ms. Conway, Charlie's mother. I think that if you're going to introduce a sort-of-main character in the first movie, you should stick with it in the second.
In D2, the Ducks get accepted into the Goodwill Olymipic Games. They get some new players who they aren't getting along with to well in the beginning, but who they sort their differences out with. In the Olympics, they go up against teams from all over the world, but with none are they so competetive than with the favored-to-win team, Iceland.
The coach of the Iceland team is sort of like Coach Riley in D1, but is, I think, more extreme. Coach Bombay has kind of the same "screw up" that he had in D1, but another old man, who is filling Hans' place in his hockey store when the owner is absent, helps Bombay sort things out.
In the end of the movie, Iceland and the U.S are set up in the big final game. Who wins? Well, I can't tell, but it's a great ending.
Summing up, I think that D2 was better than D3, but not as good as The Mighty Ducks.