A lot less bugs than in Harry Potter Years 1-4 makes it a lot more fun.
There is no more glitches about the cauldrons, where you cannot complete the game unless you start a new game from scratch. The only bug I encountered is that my character was stuck behing a staircase. Since I played local multiplayer, I just had to abandon and get back into the game and that was fix. We did not lose anything since the other player was still in the game.
I still love the fact that the screen splits so the 2 players can mostly go on their own way. Also, it splits in a way that it is easy to find your partner when you need to help him.
As usual, there is plenty of stuff to find for the completionists. It takes a good 25 hours if you want your 100% completion. There are 200 characters to find and buy (with in game coins), there are 200 golden bricks to gather and 24 levels +1 where you have to get 1 000 000 coins.
Graphics look as nice as a LEGO game can be in my opinion. The sound needs to be cranked up a bit, but nothing major.
I recommend you to play this game with your kids or girlfriend/boyfriend. It is a lot more fun with a person beside you and who can help you when you are stuck on a puzzle or want to get somewhere and it just seems impossible from your point of view.
At around 20$ in regular price, it sure worths every penny.