I went to Kings Island on the 7th of July and I had a bad day because of the huge crowd and constant breakdowns. I got there at opening and waited 'til KI opened it's gates then ran to DB. It was broken down for about 1.5 hrs so I managed to move myself up to front of the line. Then went to Beast, waited for an hour, then it broke down. I went to Firehawk, broken down. After a couple hours of riding other coasters I went back to Beast and waited aanother hour. Then what-do-you-know, it breaks own, AGAIN!! So most of the day there 4 biggest coasters were broken down making every ride have a HUGE line because of the crowd. O, and did I mention I went on a Tuesday not a weekend. So DiSab I feel your pain.
But for anyone who wants to ride Diamondback without a 3 hr wait I highly recomend getting there before 10 and waiting for the gate to open so you can be one of the first of the day to ride it before it breaks down.