Like many (I assume), this was the first Indian film I'd ever really seen. And like many, I presume, the first time a song/dance number came up, I was surprised, and even started laughing. I thought it was a joke. But toward the end of the movie, as it got darker, more violent, more depressing, I realised the importance of the musical bits. They do add quite a lot to the movie, and actually drove me to download many of them, they're so catchy.
In the end, while the film quality is lacking at times, the acting, music and flamboyantly dramatic direction make this an incredible film, and a favourite of mine. That, and the women are hot Hot HOT. High-five, India.
If you liked Shah Rukh Khan in this movie, and are in the mood for a good old fashioned Bollywood comedy, check out Dilwale Duhania Le Jayenge. It's alternately in Hindhi and English, which makes it confusing for a bit, but it's fairly enjoyable.
Overall, Grade A work.