Nate Silver may suck when it comes to primaries, but he is so far 100/100 in predicting how each state will go in a general election.
So what? Most of us that are honest on here could probably hit somewhere between 47 and 51 (states + DC) once the general election rolls around assuming the polling data is somewhat accurate and comprehensive.
Silver will weigh the polls a bit, but from a pure numbers perspective, if you follow the polling enough, you'll do pretty well.
Silver did miss in the off-year election by a seat or two in the Senate, IIRC.