Mostly, they are just confused. A lot of them are partisans getting ready to vote in the primaries of the party they actually oppose, hoping to sabotage the general election for that party by selecting the "worst" candidate. So, in theory, the new primary system, besides encouraging a lot more campaign spending, could create a race to the bottom.  This, along with Colorado voters' recent hamstringing of their own right to amend the state constitution, shows what a smart bunch of people Colorado voters are.