I'll keep it simple, Good all round team (QB RB and WRs) but this is where I see you will either flourish or die.. Ertz.
The guy would be consider a SUPER sleeper. Brent Celek, even though he pretty much sucks (had him on my team once... ONCE) and I foresee that either dooming or helping Ertz. What Ertz sucks at is pass blocking, he improves that, he has more chances to get you some good points, until then... you gambled big. I do like to do some gambling sometimes though haha.
Chargers fan by chance? Only reason I ask is because 12 team league and you have the Chargers... I think they are a #20 defense and that's giving them more than I should maybe.
Also I'm personally not a McFadden fan and I don't think he will do very well. RB2 running back in a 12 team, yeah he'll do. His number will increase from last year because he won't be just a wall to block with, but with raiders O-line I wouldn't expect anything close to spectacular.