Well, I would not be surprised is you are correct, though there were recall on other items that ran on past that year. Exhaust manifold cracking was going on for a long time and then it was removed from the list for some reason. But, I think if you have not had any problems that you are one of the lucky ones. I'm not saying that each and every head will crack or does crack, they just do this much more then other vehicles. Mitsubishi had some management problems back in the days too that caused some bad manufacturing.
I probably shouldn't condemn every truck, but I can say with experience that I hear more issues with overheating and head damage resulting in some form or another then any other major problem with them. My truck is on it's fourth head in a span of 275K miles and only the last one has held up longer then them all and doing well. Though it is one that was cracked and was repaired professionally. So, again, not every single one is bad, but many are and many are cracked and people don't even know it. The cracks don't always rear their heads up until a head is removed and inspected carefully.