Some of the interest, or the lack thereof, in the primaries - as in how many people show up to vote has to do with party affiliation. I live in a state with closed primaries, and since I'm registered "independant", I can't vote.
But I'll be there in November. I've voted ever since I was 18. My rule is, if you don't vote, you can't complain. Voting is the chance to make your voice known. Now I admit, I have voted for the "lesser of evils" quite often. I don't really remember being enthused about any presidential candidate.