I loved this episode! It was good ole big bang theory fun. Sheldon on helium, I'll admit, was a hilarious sound. But his vengeance prank was even more amusing! There were some excellent references as well, I especially liked the batman reference, with joker and batman.
However, the howard storyline did not interest me whatsoever. I thought it was very boring. His song was somewhat amusing but that was about the extent of my interest in that storyline. But him and his mother yelling at each other while he is having a bubble bath with champagne was quite funny.
It was an alright episode, but hopefully it gets better :)