I thought the show was great. The Killers have a lot of potential to be successful (along the lines of Dandy Warhols or Fountains of Wayne), and I'll bet anything they produce a song that either is featured prominently in a mass-market commercial or on some FOX show. They won't become superfamous but they'll be able to avoid getting a real job.
I gave Ambulance three songs and while I can see what they're going for, they don't have the songs or the chops to get there.
I predict Stellastarr is going to reach Smashing Pumpking/Nine Inch Nails level of success in a couple years/records. For a first record, their debut is remarkable. Rather than being a fully formed band, they're going to build on their songwriting and sound and become a sort of American Verve. They've got well-structured, interesting songs that get "emotional", they put on a good live show and have the discipline to crank up the amps without getting too wonky-jammy or noisy, they're genuinely artsy *and* savvy, and they're all good-looking. They played the songs a little too exactly to their counterparts on the record, but Oasis and the Strokes didn't get to where they are by being Phish.
They're going to continue getting better. I'll even go out on a limb and say I won't be surprised if, in 10 or 15 years, they are revered in the way that the Smiths, the Pixies or Pavement is now.
And Sleater-Kinney will be long forgotten.