Not sure about emotionless i thought he played the crowd well to be honest. The thing that annoyed me was the way Slater (ie the scriptwriters) ruined the suprise by saying "im the ruler of the world", etc, making it abundantly clear to anyone who remembers the vicious one as to who was coming out. Considering his place in history, ex wwf & wcw heavyweight champion and the amount of time passed since he appeared in wwe, i thought it was a bit of a low key comeback for Sid, they could have made it more of a big deal imho.
There were at least 2 official twitter accounts from WWE that mentioned Sid before his match. So Slater didn't ruin it for me the "WWEInsider" ruined it for me in the first 30 minutes.