Nothing. Two words for this film: Fucking Badass.
Yes, even as an avowed fan-boy, there wasn't a single thing about this film that bugged me. It was beautifully shot. It was well-written. The jokes fit in place instead of standing out. The action was classic. The story worked well. The actors did a great job.
Only a couple times did I get an "effects" feel...but it also was a good feeling to see them use more classic techniques (such as miniatures) instead of relying on the CGI. Only a couple times did I feel like the action was over-the-top...but it fit the feel of the pulp action novels, and wasn't stupid.
I was afraid that Hollywood's tendency to skimp on the story in favor of one-liners would take hold. Sure, there were some great one-off lines, but they felt like part of the dialogue, not as catchphrases (and the couple catchphrases that WERE there were the ones you expected to hear, and, frankly, wanted to hear).
OK, OK, no Nazis...but there were Russians, which fit well into the time and setting. So, we still had evil foreign types mucking about. And, speaking of Russians, I'm completely impressed with Cate Blanchett. Even knowing she was in the film, her part was played well enough that I forgot she was in the film at all until seeing her name again in the credits. THAT'S a well-acted role. I haven't seen a single thing that Shia LeBeouf has done, so I had no idea what to expect from him, but he played his part admirably. And Harrison Ford, well...the man is Indiana Jones. Excellent performances by Karen Allen, Ray Winstone, John Hurt, and Jim Broadbent (as usual).
I was even pleased to see that the very end, when it looked like they were gonna go for a "sequel set-up" moment, they shut it down.
Ten out of ten, five stars, if you've got an ass it'll kick it. See it. See it ASAP.