The PC adaption (and iPad/iPhone versions too, for that matter) of Ticket to Ride is a very faithful recreation of the classic board game, where the only gameplay differences between it and the physical version are fast and accurate scoring and the fact that enraged board-flipping is no longer a possibility. (Not to mention the bonus of the game + DLC being cheaper than their physical counterparts, and is significantly easier to play with people on the other side of the world!) So, for people who have played the board game before, I think this should be a no-brainer.
However, I wrote this review for those who aren't aware of the greatness that is Ticket to Ride and are seeing this from a bystander's point of view. You might be thinking that this is just some boring train game played only by weird people who smell funny, as a diversion from their regular riveting pastime of watching grass grow. However, I can assure you that this is most certainly the opposite of the truth.
Ticket to Ride is, in actual fact, quite a tense game that can quite easily take you from absolute confidence in your position to having all your hopes and dreams shattered, as you realise that you didn't take that vital Los Angeles > Las Vegas track yet due to over-confidence, that you had multiple 20+ point routes hinging on! Not to mention the level of back-stabbing and collaboration that can come into play (especially with the Steam overlay making this oh so easy), that can easily create bitter feuds between two rival rail barons, which can last across a series of games.
Overall, I strongly recommend this game to anyone who wants an enjoyable, classic example of a game that's easy to learn, but difficult to master. It's always a good game to play with friends, strangers or alone with bots, especially as each game tends to only go for 45 minutes at most. (Although you can quite easily find that time has flown, as you wind up having rematch after rematch, without noticing the time passing by!)