openttd has been in development for a very long time. i hope we will see lots of further development in TF as well.
how deep you view the gameplay also depends on what you see as gameplay. for me the track construction is a huge part of the gameplay, and TF is the first game of that kind that offers a realistic representation of that due to the terrain and gridless construction. its the first time that railroads will look like real railroads. to be honest i’ve never been interested in railroad tycoon or openttd at all, not because of missing eye-candy, but because i can’t stand grid based construction.