I would give this game a 10/10 even though there were some things I didn't like about the story.
First off, who in the hell would approve a facility like Arkham City!?
How in the hell would street traffic work if it were still a part of Gotham?
And how in the hell did they establish that area so quickly? They kicked everybody out and sealed the area off? Including the Gotham Police dept., movie theaters, and an amusement park?
And if it's just a mile or so from the rest of Gotham, swimming, why hasn't everybody escaped, yet?
And in the end, when all of those helicopters were killing everybody in the city, why didn't Batman just take out the choppers? He let a thousand people get killed while he looked for access codes!!
And how in the hell did every villain in Gotham wind up in Arkham at that precise moment? Joker, Mad Hatter, Mr. Freeze, Two Face, Penguin, Dead Shot, Bane, Clayface, Black Mask, Ras Al Ghul (which really made me say WTF!? This guy should be in Arabia or something!) Catwoman (who LIVES IN ARKHAM CITY!?), Solomon Grundy, etc. What the hell?
And how about all of the announcements over the P.A. system where Hugo Strange spoke directly to Batman and called him "Mister Wayne'? Nobody else heard this? He had a staff of a thousand guys!!
And yet, despite all of this, I was able to suspend my disbelief and enjoy the game more than any other game I've played this year. I looked across the harbor and saw Arkham Asylum in the distance and I said out loud, "This is awesome." I will gladly pay for the Robin and Nightwing DLC and I'm hoping for a ton of costumes, Huntress, Batgirl, Spoiler, Azrael, and more! Oh, and I HATED Robin's voice. Doesn't sound anything like any Robin I've ever heard and definitely not the Tim Drake I've read in the comics. He sounds kinda dumb, actually.