Ugh, so I borrowed the game to try it out.
I bought 2010 and 2011 and liked them, but the difficulty of just being able to sit down and play without the game crash or some bug intrude or my save file corrupt itself got too much. I tried 2012 before buying, but too many of the same things went wrong for me to justify giving them my money.
2013 seems to be more of the same, unfortunately. When it works, it's really a very enjoyable game. Physics feel very pleasant, if not razor sharp. It's a very nice looking game. The additional modes are excellent. There's a nice feeling of accomplishment when you storm past half a dozen guys to take the win.
But I spent an hour and a half just trying to get some settings where my wheel felt right (Fanatec CSR). The menu setting labels are still arcane. The buttons on the wheel still don't work right, Shift Down paddle is confirm for some reason so I'm constantly groping around my wheel for the right buttons in menus. I've had it freeze up twice during scenario mode and once during Young Driver test, ditching my progress as it does.
And I ask myself, why bother? I just want to play the game, not try and work around all this BS. I want to drive, not play QA Assistant Simulator 2013.
I think my feeling is more or less the same as it has been since 2010: Pretty good game that is horribly crippled by not "just working". The races and scenarios are great, it's everything else that spoils it for me.