Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is an Annie build I've played for a while, and I usually get up with a 4:1:4 ratio or higher. 16/1/12 would be an example of a good game. Bad games I can usually still maintain a positive "score"(half assists + kills - deaths. k-d+a/2) but these only happen if the other team is stacking magic pen(you can get a void staff to help with this), your team doesn't know what a team fight is, you get outplayed.
If you notice this build doesn't have a lot of health, so you have to be careful and stick around teammates most of the time. Don't wander the forest alone or big bad warwick is going to slice your lips and tongue from your head with a linoleum knife.
I'll put up another build for an annie with more survivability.