I haven't read the book, but the movie was still enjoyable for me. It was fast-paced, a little too much at the beginning I feel. Definitely a lot of surprises and plot twists! Just when you think you have it figured out, you're proven wrong. Engrossing enough that the time flies right by.
Ryan Reynolds as Wade Wilson, dead on! He nailed it and I was sorry to see (but understand why plot-wise) that he didn't play a bigger role.
Deadpool...I've read a little about the ending since I saw it last night, and if that was actually a Deadpool clone then all is forgiven! Otherwise...not-so-much