IT's too early to bitch about the performances, we haven't seen them in full yet.
Plus it was the first date, she obviously has to take more confidence. And she had never performed in such a huge stadium (except for South American), so I think she was very nervous.
Keep in mind everyone we've only seen part of everything:
1) The Korean Government prevented her from using some songs/props so we'll prob see more later
2) Remember that there's apparently 4 stages? I guess this is the 1st
3) The other 3 Armani Dresses