Grey's Anatomy, "Piece of My Heart": No 'Practice' makes perfect?

"Grey's Anatomy" spoilers coming up just as soon as I code...

Dammit, Addison, you can go home again! Both you and "Grey's Anatomy" were so much, much better for your return. Addison got to be tough and smart and fearless again instead of the ball of goo she is on "Private Practice" -- somebody want to explain to me again why Addison thinks she's so much healthier in California? -- and she got to play the role of viewer surrogate, telling most of the main characters what they needed to hear, and what had become plainly obvious to those of us at home on the couch: Meredith and McDreamy are being morons with all their break-up shenanigans, Hahn is a lesbian and hot for Callie, Izzie needs to quit her two season-long self-pity party, etc.

Many of the characters still bother me, but with Addison there to call them out on it, it at least becomes clear that Shonda and company aren't in denial about who and what they've let their heroes become.

Plus, the Hahn/lesbian thing alone led to two of the funniest "Grey's" exchanges in a long time: Cally declaring her love of penis, and Meredith and Cristina's explanation for why no one's ever mistaken them for a gay couple:

"No, because we screw boys like whores on tequila."
"And then we either try to marry them or drown ourselves."

That said, I hope they're not taking this to a place where Callie and Hahn actually become a couple. Callie has been written as an explicit penis-lover for quite a long time now, and to have her switch teams -- as opposed to having to navigate around the awkwardness of her new best friend being attracted to her -- smacks of desperation and of the writers not knowing what to do with her since they broke up her marriage.

Also on the plus side for the episode: I like that there are now some advantages to George's life as a repeat intern, I loved Bailey wanting and yet not wanting to open up to Addison about her marriage, and he elevator scene was a very well-orchestrated punchline to years of awkward elevator rides.

On the minus side: Ava/Rebecca faking a pregnancy to suck in Karev, more sledgehammer parallels with Mer/McDreamy and their tumor patient and his wife, and the fact that Izzie with a backbone is still Izzie.

What did everybody else think?