It's hard to say how bad it is.
All actors have an accent which is strange. Either speak Chinese with sub, or English. This in between solution makes no sense.
The story is quite bad. The reason Mulan is awesome is no more because she is hard working and dedicated with a strong will power. But because she has the ''Chi'' which is the same as the force. So the entire woman = man message is cancelled for Disney selling you some extra force.
The movie is not that pretty either...
The second star is actually mostly because we had a lot of fun watching the movie fall apart.