Lego Batman is the best 45 bucks I've ever spent (it actually only cost me eight dollars after some trade-ins). Seriously. I played for eight hours STRAIGHT yesterday and I couldn't even tell you how many hours today. Matt and I made a pact not to play without each other and I'm now going through withdrawal since he's recording tonight.
Of course, I've read god-only-knows how many issues of Batman comics and have tons of Batman memorabilia, including a lunchbox with a cape and utility belt, so it's fair to say that I'm obsessed with Batman in general. Your mileage may vary.
Batman! Na na na na na