To be fair, this was also the case with SimCity 4's "always the shortest path, no matter how congested it is" pathfinding, until fans fixed that part.
I actually found that part kind of fun! I do think that the cycle of gaining deeper understanding about how the simulation works, then redesigning your cities to work around it is pretty fun in a general sense. Really, the only problem with 2013 is that a) redesigning your city around 2013's pathfinding issues makes you end up with dumb, intersectionless cities, which feels "cheap", and b) even in the extreme case, there's only so much you can do about some of the pathfinding issues.
Last night, I had 3 school busses going to the same 2 stops over and over again, ignoring the rest of the city. No wonder my city's children are such little hoodlums.
[EDIT] I originally intended this to be a reply to potatolicious' post. Whoops.