Now this is what Batman is about!
This is pure, unadulterated Batman. An engaging, excellently written storyline by veterans of the renouned Batman Animated Series, and featuring several cast members from said series, this is a game that you'll enjoy several times over, and with plenty of extras to unlock and find in this open-world game, you'll certainly get your money's worth.
The Game of the Year Edition comes with all previous DLC on the disk, and it's pretty good. Alternating between "slugfests" involving Batman going against grunts of varying difficulties in various locations in and around Arkham (and one in Gotham itself) and stealth modes where Batman has to fulfil several ways of taking down grunts, it's very challenging and actually quite hard, even on the Easy difficulty setting.
The graphics are supreme, although due to the way the game works you may spend most of your time in "Detective Mode", which takes away this aspect considerably.
The combat, while simplistic (three-button mash, pretty much), is awesome to watch, and when you get a combo right (there's achievements for 20 and 40 hits combos), you'll revel in your mastery (and mock the goons that you've just pasted) for a long long time.
Featuring cameos or references to pretty much every major villain in Batman's history, and several not so major ones (Tweedledum and Tweedledee anyone?) this game is a fantastic game in it's own right.
As for the 3D, I don't really notice it myself, but that's just me.