Full review can be found on my blog.
First of all, let me say that this was a great sequel. It was interesting and you were able to get to know the characters better.
I was really keen to read Insurgent. I started as soon as I finished Divergent, I just had to know what happens to Tris.
Insurgent didn't grab me as much as Divergent but I didn't hate it. It is still a great read and I'm looking forward to the third instalment in the series to see where this goes.