Are XBLA Games Getting Better?

Xbox Live Arcade launched with the Xbox 360 back in November 2005. At first it was populated with retro arcade games and modest (but awesome) new titles like Geometry Wars. But four and a half years later we've got first-person shooters like Battlefield 1943 and enormous efforts like Shadow Complex that continually raise our expectations of what a downloadable game can deliver. So XBLA games are getting bigger and more sophisticated -- but are they getting "better?" Downloadable games were new territory for consoles back in 2005, so as developers learn the ropes of what does and doesn't work are the fruits of their labors getting sweeter?