I still don't really see a reason to leave F1 2011 behind, think that I still prefer to play that and some 2010 then these newer titles.
GFWL is shutting down next year so I guess that's a reason
I had a 100% race in Melbourne to kick off F1 2013. It's fun. I didn't play too much of 2012, because I didn't like the handling, but to me, 2013 feels more like the 2011 handling (which I did like).
Handling is what killed 2012 for me and you're tempting me with that comment but I must stay strong because this game will inevitably turn out to be completely broken and Codemasters will patch it a few times but never fix it..