Both intriguing and infuriating. Like a massive puzzle as soon as you solve one challenge, there is another waiting.
When ever this happens there are usually two reactions: I try to uncover the cause and fix the choke point; Or give up after just fixing 30 choke points and having more to do! This game just won't let me "win."
If you don't know what I'm talking about- it is how when large portions of the city start to have a connection via the transit system it makes it increasingly difficult to just keep from having 200+ people stuck at a bus stop (which will happen somewhere). And if you fix that choke point, the one right after it will get clogged, then the next, etc. Fixing these requires more planning, more head scratching, and eventually giving up.
I'm not good at solving puzzles and this game is one hell of a puzzle.