A film with Colin Firth, Samuel L. Jackson and Michael Cain? What a combo! While some of the story elements were rather predictable, it wasn't that big of a problem because the movie was FUN. I genuinely had a good time watching the film, the story had a good pace and kept moving along to the predetermined conclusion.
Did you ever see a James Bond film where James Bond loss to the villain(s)? No. That defeats the whole point of being James Bond. Still, it was fun, so you overlook that kind of thing. Firth played a convincing secret agent/father/mentor figure to the main protagonist. SLJ hits it out of the park with the perfect amount of crazy and evil. Like most great bad guys, they don't see anything evil about what he is doing. Michael Caine takes on the traditional M role in the secret agent organization that has a neat back story quickly explained by Firth's character early on in the film.
Taron Egerton plays the young gun, child of Firth's old partner that he attempts to refine into a Kingsman. There are several themes throughout the film. One that is brushed upon in several aspects is that the old ways/world clashing with the new. The spy game has changed and people have changed. Manners Maketh the Man, as Firth's character often says. Which clashes with Egerton's character. A disgruntled youth with no manners.
The environmental or eco-terrorist story elements made me think of the Star Trek Deep Space Nine episode Our Man Bashir. Samuel L Jackson's character has a similar way to remake the world as Dr. Noah did in that holodeck run a muck episode.
Mark Hamill makes a surprise appearance at the start of the film. The ending goes on for a little bit, but that's probably because they want to make sure everything is 'ok' for the protagonist. Matthew Vaughn provided his normal show of violence during the ladder half of the film. I will say though that compared to some of his other works the violence was a bit more humorous than say Kick-Ass. Still, I can see why some might have rolled their eyes at it.
All in all a good movie that doesn't try to be something it isn't: A James Bond film namely. Will the Kingsman be back? Might be. If you believe everything you see on Rotten Tomatoes, the film has a pretty good rating from critics and audiences. That usually tells studios they should consider a sequel.