The 57th Berlinale, as the festival here is known, might best be thought of as an average festival. Not only because the films were generally so-so, with a few outright disasters balancing some high-quality work, but also because it seemed to typify what a film festival is these days. Once a bastion of difficulty and high seriousness--an identity that suited an event held in midwinter in a city with a vexed, often grim history--the Berlinale, which began last Thursday and concludes with awards on Sunday--has grown into something bigger, more varied and perhaps less distinctive. A.O. Scott gives his take on the Berlin International Film Festival, which concludes this weekend.