Bill,
I avoid them. We are a board gaming family, and, when we find one we like, we play it over and over. With legacy games, you are sort of hosed if you really like a chapter.
The counterpoint, however, is that if you are a person who plays a game once then shelves it, then these sort of games offer you a fresh experience without learning a new rule set or taking up shelf space!
We’ve never tried Ticket to Ride, having heard some of the same criticisms that Craig ( @ctown2 ) mentioned. We have Railroad Tycoon, which is a slimmed down version of the classic Age of Steam (haven’t played Age of Steam) and loosely based upon the eponymous video game series. TTR is a pathfinder game; RRT is a routed builder game. You have a three actions per turn, the game lengths vary, and, while geography is constant, “industries” (abstractly represented by colored cubes) vary each game.
RRT is now published as Railways of the World (10th Anniversary Edition). While pricey, you will get a ton of gameplay out of it, and it is pretty easy to teach. For the record, I would add we only play on New Years Eve, an event which has become a tradition over the course of about 20 years. In the age before marriage, it came off the shelf at least monthly.
You might also try Village Rails. This plays in about 20 minutes and is also a route builder nominally set in rural England in the late 1800s. This is one of our “airport games” when we travel, as your railroad “empire” is a rather small tableau.
Eric