I've already watched it in the cinemas twice, and thanks to the movie, even picked up the book. It's my new favourite movie, and has lots of plot twists, so that it seems confusing and keeps you on your toes, but eventually fits together like little puzzle pieces. I think the main issue people are having with the movie is just because of profanity and violence, which is obviously why it's rated 15+, so grow up. The entire movie is about several assassins on a train, so you should expect a lot of blood, but there isn't really as much as some of the one star ratings are saying. As for the "dropping the f bomb every other sentence", yes. Yes. Tangerine is probably the most accurately portrayed British character, which I personally find relatable, because that's exactly how most people I've ever met speak, especially in a stressful situation, which the character is constantly in during the movie.
Of course he's going to swear. As do most human beings. The cast of the movie was filled with great actors, and even had a few cameos including Ryan Reynolds. The colours were bright and eye-catching and the music was perfect for the more emotional scenes. I loved it so much and will probably be getting it on dvd whenever I can.