Well, it is, and I did ... last night!
I've been holding on to a bunch of Microsoft Points, waiting for this day to arrive, so when I saw (via NeoGAF) that the "Pink Knight Pack" was finally available for download--and for free, no less--I raced over to our TV, turned on the Xbox 360 and bought the sucker (Castle Crashers, that is) with nary a second thought.
I've barely scratched the surface of the game thus far, but the little I have, er, scratched has proven to be quite fun. Of course, how could it not be fun when you're controlling a little pink knight who wields a lollipop as a weapon and who unleashes a giant, Slinky-like rainbow as a magical attack?
See also: 'So, where's the Castle Crashers Pink Knight Pack for XBLA?' and 'I guess this means I'm going to have to get Castle Crashers soon'