Two Face is a good icon to represent this game
The first and foremost fun killer is WAY TOO MANY places to fall off. It is as if the designers wanted to kill the players more and when you have to slow down and concentrate on not falling off an edge...fun killer.
The second fun killer is much more subtle and it is Batman, our lead character. In all other Lego installments, all the characters were silly and making fun while having fun. Robin is the class clown and trying too hard, while Batman frowns and grumbles like a disapproving parent/adult. When I play Lego games, I want to be kid like and have silly fun, so this is a subtle (darker) fun killer.
So why did I give it an 8.0 then with all this fun killing? Because you can get over it with experience and this game will grow on you. I really like the batarang weapon, which takes a bit of a learning curve to use, but once you get the hang of it, it is more engaging and fun than auto aim guns.
This is also a very deep game, with 15 standard episodes (broken into 3 chapters) as heroes and the same amount as villians. Playing villians in this is a lot of fun and you get to see their side of the same story you played as B&R. Very cool and well done.
I also like the specialty suits B&R have, as it highlights the type of hero Batman is, using inventions and technology to over come lack of super strength or mutant abilities.
All is all this is a very good game, it just needs time to get used to, as the 'fun killer' items take away from the initial smiles I had in other Lego games. Once you get over that though, it is fun, challenging and offers a lot of deep game play. Enjoy.
Roll D6