I agree with Kaona that the confrontation between Sugou and Kirito felt rushed and that we didn't find out what happened to Sugou until later, but in the same token, they'd have to take time away from another part, which I wouldn't want. Given how well the rest played out, I'm very happy with this ending.
As soon as the ending came up, I started humming Crossing Field in my head and it came up anyway. So I fully expected it for whatever reason. =D
I was browsing MyAnimeList last night and there's a lot of hate for this anime there. =S Makes me cry a little.
Fantastic anime, 9/10 for me as well. Having never read the light novels, I'm not sure if they changed anything huge, but I was happy with the end result. =)