Having off-year elections allows a focus on state instead of federal issues in election season, and for that I consider it a very good thing.
It's a choice between low turn-out and 'focus' and I don't see how state or federal issues are that much different. It's not like you're going to be doing A federally and B at the state level or that the state elections are going to get crowded out by federal ones. Portland, OR has its mayoral elections in presidential years and there's plenty of discussion of the issues. I don't notice things being inadequate compared to the coverage in Los Angeles' off-year mayoral election. Same thing with Governor and even then you have mid-terms, there's no need to go off-year for Governor and the state legislature.